java.io.EOFException happens frequently

I find out from log4j log that there are 100x of this exception every day

com.aerospike.client.AerospikeException: Error Code 9: Timeout
	at com.aerospike.client.command.ReadCommand.parseResult(ReadCommand.java:121)
	at com.aerospike.client.command.SyncCommand.execute(SyncCommand.java:60)
	at com.aerospike.client.AerospikeClient.get(AerospikeClient.java:508)
	at org.springframework.cache.aerospike.AerospikeCache.get(AerospikeCache.java:58)
	at org.springframework.cache.interceptor.AbstractCacheInvoker.doGet(AbstractCacheInvoker.java:68)
	at org.springframework.cache.interceptor.CacheAspectSupport.findInCaches(CacheAspectSupport.java:533)
	at org.springframework.cache.interceptor.CacheAspectSupport.findCachedItem(CacheAspectSupport.java:499)
	at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:389)
	at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:327)
	at org.springframework.cache.interceptor.CacheInterceptor.invoke(CacheInterceptor.java:61)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:655)

com.aerospike.client.AerospikeException: java.io.EOFException
	at com.aerospike.client.command.SyncCommand.execute(SyncCommand.java:93)
	at com.aerospike.client.AerospikeClient.get(AerospikeClient.java:508)

com.aerospike.client.AerospikeException: Buffer pool take interrupted.
	at com.aerospike.client.async.AsyncCluster$BlockBufferQueue.getByteBuffer(AsyncCluster.java:124)
	at com.aerospike.client.async.AsyncCluster.getByteBuffer(AsyncCluster.java:75)
	at com.aerospike.client.async.AsyncCommand.execute(AsyncCommand.java:67)
	at com.aerospike.client.async.AsyncClient.put(AsyncClient.java:228)

I am using CentOS 7.3 aerospike-tools-3.12.0-1.el7.x86_64 aerospike-amc-community-4.0.12-1.x86_64 aerospike-server-community-3.12.0-1.el7.x86_64 aerospike-client-3.3.2-jar-with-dependencies.jar resin-4.0.49-1.x86_64 jdk1.8.0_121-1.8.0_121-fcs.x86_64

The VM is having 8 cores 40GB RAM Kingston SSD HDD

The following is aerospike.conf

service {
	user root
	group root
	paxos-single-replica-limit 0 # Number of nodes where the replica count is automatically reduced to 1.
	pidfile /var/run/aerospike/asd.pid
	service-threads 4
	transaction-queues 4
	transaction-threads-per-queue 4
	proto-fd-max 100000
	proto-fd-idle-ms 15000
}

logging {
	# Log file must be an absolute path.
	file /var/log/aerospike/aerospike.log {
		context any info
	}
}

network {
	service {
		address any
		port 3000
	}

	heartbeat {
		          

		# To use unicast-mesh heartbeats, remove the 3 lines above, and see
		# aerospike_mesh.conf for alternative.
                mode mesh
		address 192.168.10.168
                port 3002
                mesh-seed-address-port  192.168.10.168  3002

		interval 150
		timeout 10
	}

	fabric {
		port 3001
	}

	info {
		port 3003
	}
}

namespace test {
	replication-factor 1
	memory-size 4G
	default-ttl 30d # 30 days, use 0 to never expire/evict.
        ldt-enabled true
	storage-engine memory
}

namespace bar {
	replication-factor 1
	memory-size 4G
	default-ttl 30d # 30 days, use 0 to never expire/evict.

	storage-engine memory
}

namespace opentravel {
        replication-factor 1
        memory-size 10G
        default-ttl 30d # 30 days, use 0 to never expire/evict.
        ldt-enabled true
        storage-engine device {   
		file /cache/aerospike/data/opentravel.dat
               	filesize 4G
               	write-block-size 1048576
		max-write-cache 128M
               	data-in-memory false # Store data in memory in addition to file.
        }
}

I need to find out if my configuration is incorrect, the SSD is not good enough or something else?

What timeout value are you giving when doing this? Do your histograms show any latency when you experience this issue?

I am using the default value of aerospike java client.

The following is the histogram

Admin> show distribution
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~hotelbeds - TTL Distribution in Seconds~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                Percentage of records having ttl less than or equal to value measured in Seconds                                
                                  Node       10%       20%       30%       40%        50%        60%        70%        80%        90%       100%   
roomstays-a localhost.localdomain:3000   1890924   1890924   1890924   2521232   26472936   29939630   29939630   29939630   29939630   31515400   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~bar - TTL Distribution in Seconds~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Percentage of records having ttl less than or equal to value measured in Seconds         
                                  Node   10%   20%   30%   40%   50%   60%   70%   80%   90%   100%   
roomstays-a localhost.localdomain:3000     0     0     0     0     0     0     0     0     0      0   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~giata - TTL Distribution in Seconds~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                            Percentage of records having ttl less than or equal to value measured in Seconds                            
                                  Node      10%      20%       30%       40%       50%       60%       70%       80%       90%      100%   
roomstays-a localhost.localdomain:3000   310752   854568   1217112   1268904   1760928   2045784   2356536   2356536   2408328   2589600   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~gallop - TTL Distribution in Seconds~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Percentage of records having ttl less than or equal to value measured in Seconds         
                                  Node   10%   20%   30%   40%   50%   60%   70%   80%   90%   100%   
roomstays-a localhost.localdomain:3000     0     0     0     0     0     0     0     0     0      0   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~qunar - TTL Distribution in Seconds~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                             Percentage of records having ttl less than or equal to value measured in Seconds                            
                                  Node      10%       20%       30%       40%       50%       60%       70%       80%       90%      100%   
roomstays-a localhost.localdomain:3000   206416   1290100   1419110   1419110   1754536   1935150   2064160   2347982   2451190   2580200   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~abreu_online - TTL Distribution in Seconds~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                             Percentage of records having ttl less than or equal to value measured in Seconds                             
                                  Node       10%       20%       30%       40%       50%       60%       70%       80%       90%      100%   
roomstays-a localhost.localdomain:3000   7182297   7182297   7722900   7722900   7722900   7722900   7722900   7722900   7722900   7722900   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~mikitravel - TTL Distribution in Seconds~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                            Percentage of records having ttl less than or equal to value measured in Seconds                            
                                  Node      10%      20%       30%       40%       50%       60%       70%       80%       90%      100%   
roomstays-a localhost.localdomain:3000   309948   826528   1239792   1265621   1291450   1368937   1833859   1833859   1833859   2582900   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~uapi - TTL Distribution in Seconds~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Percentage of records having ttl less than or equal to value measured in Seconds         
                                  Node   10%   20%   30%   40%   50%   60%   70%   80%   90%   100%   
roomstays-a localhost.localdomain:3000     0     0     0     0     0     0     0     0     0      0   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~sunseries - TTL Distribution in Seconds~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Percentage of records having ttl less than or equal to value measured in Seconds         
                                  Node   10%   20%   30%   40%   50%   60%   70%   80%   90%   100%   
roomstays-a localhost.localdomain:3000     0     0     0     0     0     0     0     0     0      0   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~test - TTL Distribution in Seconds~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Percentage of records having ttl less than or equal to value measured in Seconds         
                                  Node   10%   20%   30%   40%   50%   60%   70%   80%   90%   100%   
roomstays-a localhost.localdomain:3000     0     0     0     0     0     0     0     0     0      0   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~hanatour - TTL Distribution in Seconds~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                             Percentage of records having ttl less than or equal to value measured in Seconds                             
                                  Node       10%       20%       30%       40%       50%       60%       70%       80%       90%      100%   
roomstays-a localhost.localdomain:3000   1995000   1995000   1995000   1995000   1995000   1995000   1995000   1995000   1995000   1995000   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ctrip - TTL Distribution in Seconds~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Percentage of records having ttl less than or equal to value measured in Seconds         
                                  Node   10%   20%   30%   40%   50%   60%   70%   80%   90%   100%   
roomstays-a localhost.localdomain:3000     0     0     0     0     0     0     0     0     0      0   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~opentravel - TTL Distribution in Seconds~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            Percentage of records having ttl less than or equal to value measured in Seconds           
                                  Node   10%   20%   30%   40%   50%    60%    70%    80%    90%   100%   
roomstays-a localhost.localdomain:3000   855   855   855   855   912   1254   1767   3534   5700   5700   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~hotelbeds - Object Size Distribution in Record Blocks~~~~~~~~~~~~~~~~~~~~~~~
      Percentage of records having objsz less than or equal to value measured in Record Blocks     
                                  Node   10%   20%   30%   40%   50%   60%   70%   80%   90%   100%   
roomstays-a localhost.localdomain:3000     2     2    11    59    99    99    99    99    99     99   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~hanatour - Object Size Distribution in Record Blocks~~~~~~~~~~~~~~~~~~~~~~~
      Percentage of records having objsz less than or equal to value measured in Record Blocks     
                                  Node   10%   20%   30%   40%   50%   60%   70%   80%   90%   100%   
roomstays-a localhost.localdomain:3000     1     1     2     2     2     2     2     2     4     99   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~giata - Object Size Distribution in Record Blocks~~~~~~~~~~~~~~~~~~~~~~~~~
      Percentage of records having objsz less than or equal to value measured in Record Blocks     
                                  Node   10%   20%   30%   40%   50%   60%   70%   80%   90%   100%   
roomstays-a localhost.localdomain:3000     1     1     2     2     2     5     6    19    20     99   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~gallop - Object Size Distribution in Record Blocks~~~~~~~~~~~~~~~~~~~~~~~~
      Percentage of records having objsz less than or equal to value measured in Record Blocks     
                                  Node   10%   20%   30%   40%   50%   60%   70%   80%   90%   100%   
roomstays-a localhost.localdomain:3000     0     0     0     0     0     0     0     0     0      0   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~qunar - Object Size Distribution in Record Blocks~~~~~~~~~~~~~~~~~~~~~~~~~
      Percentage of records having objsz less than or equal to value measured in Record Blocks     
                                  Node   10%   20%   30%   40%   50%   60%   70%   80%   90%   100%   
roomstays-a localhost.localdomain:3000     5     5     5     5     5     5     5     5     7     42   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~abreu_online - Object Size Distribution in Record Blocks~~~~~~~~~~~~~~~~~~~~~
      Percentage of records having objsz less than or equal to value measured in Record Blocks     
                                  Node   10%   20%   30%   40%   50%   60%   70%   80%   90%   100%   
roomstays-a localhost.localdomain:3000     1     2    99    99    99    99    99    99    99     99   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~mikitravel - Object Size Distribution in Record Blocks~~~~~~~~~~~~~~~~~~~~~~
      Percentage of records having objsz less than or equal to value measured in Record Blocks     
                                  Node   10%   20%   30%   40%   50%   60%   70%   80%   90%   100%   
roomstays-a localhost.localdomain:3000     1     1     1     1     1     1     1     2     2     94   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~sunseries - Object Size Distribution in Record Blocks~~~~~~~~~~~~~~~~~~~~~~~
      Percentage of records having objsz less than or equal to value measured in Record Blocks     
                                  Node   10%   20%   30%   40%   50%   60%   70%   80%   90%   100%   
roomstays-a localhost.localdomain:3000     0     0     0     0     0     0     0     0     0      0   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~~~ctrip - Object Size Distribution in Record Blocks~~~~~~~~~~~~~~~~~~~~~~~~~
      Percentage of records having objsz less than or equal to value measured in Record Blocks     
                                  Node   10%   20%   30%   40%   50%   60%   70%   80%   90%   100%   
roomstays-a localhost.localdomain:3000     0     0     0     0     0     0     0     0     0      0   
Number of rows: 1

~~~~~~~~~~~~~~~~~~~~~~~opentravel - Object Size Distribution in Record Blocks~~~~~~~~~~~~~~~~~~~~~~
      Percentage of records having objsz less than or equal to value measured in Record Blocks     
                                  Node   10%   20%   30%   40%   50%   60%   70%   80%   90%   100%   
roomstays-a localhost.localdomain:3000     1     1     1     1     2     2     2     2     2      2   
Number of rows: 1

This is the show stats of the most used namespace

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~giata Namespace Statistics~~~~~~~~~~~~~~~~~~~~~~~~~~~~
NODE                                    :   roomstays-a localhost.localdomain:3000   
allow-nonxdr-writes                     :   true                                     
allow-xdr-writes                        :   true                                     
available_bin_names                     :   32767                                    
batch_sub_proxy_complete                :   0                                        
batch_sub_proxy_error                   :   0                                        
batch_sub_proxy_timeout                 :   0                                        
batch_sub_read_error                    :   0                                        
batch_sub_read_not_found                :   0                                        
batch_sub_read_success                  :   0                                        
batch_sub_read_timeout                  :   0                                        
batch_sub_tsvc_error                    :   0                                        
batch_sub_tsvc_timeout                  :   0                                        
cache_read_pct                          :   0                                        
client_delete_error                     :   0                                        
client_delete_not_found                 :   0                                        
client_delete_success                   :   0                                        
client_delete_timeout                   :   0                                        
client_lang_delete_success              :   0                                        
client_lang_error                       :   0                                        
client_lang_read_success                :   0                                        
client_lang_write_success               :   0                                        
client_proxy_complete                   :   0                                        
client_proxy_error                      :   0                                        
client_proxy_timeout                    :   0                                        
client_read_error                       :   0                                        
client_read_not_found                   :   333056                                   
client_read_success                     :   68415710                                 
client_read_timeout                     :   0                                        
client_tsvc_error                       :   0                                        
client_tsvc_timeout                     :   41                                       
client_udf_complete                     :   0                                        
client_udf_error                        :   0                                        
client_udf_timeout                      :   0                                        
client_write_error                      :   0                                        
client_write_success                    :   333019                                   
client_write_timeout                    :   0                                        
cold-start-evict-ttl                    :   4294967295                               
conflict-resolution-policy              :   generation                               
current_time                            :   235287276                                
data-in-index                           :   false                                    
default-ttl                             :   2592000                                  
deleted_last_bin                        :   0                                        
device_available_pct                    :   89                                       
device_free_pct                         :   90                                       
device_total_bytes                      :   4294967296                               
device_used_bytes                       :   424971520                                
disallow-null-setname                   :   false                                    
enable-benchmarks-batch-sub             :   false                                    
enable-benchmarks-read                  :   false                                    
enable-benchmarks-udf                   :   false                                    
enable-benchmarks-udf-sub               :   false                                    
enable-benchmarks-write                 :   false                                    
enable-hist-proxy                       :   false                                    
enable-xdr                              :   false                                    
evict-hist-buckets                      :   10000                                    
evict-tenths-pct                        :   5                                        
evict_ttl                               :   0                                        
evicted_objects                         :   0                                        
expired_objects                         :   15800                                    
fail_generation                         :   0                                        
fail_key_busy                           :   0                                        
fail_record_too_big                     :   0                                        
fail_xdr_forbidden                      :   0                                        
geo2dsphere-within.earth-radius-meters  :   6371000                                  
geo2dsphere-within.level-mod            :   1                                        
geo2dsphere-within.max-cells            :   12                                       
geo2dsphere-within.max-level            :   30                                       
geo2dsphere-within.min-level            :   1                                        
geo2dsphere-within.strict               :   true                                     
geo_region_query_cells                  :   0                                        
geo_region_query_falsepos               :   0                                        
geo_region_query_points                 :   0                                        
geo_region_query_reqs                   :   0                                        
high-water-disk-pct                     :   50                                       
high-water-memory-pct                   :   60                                       
hwm_breached                            :   false                                    
ldt-enabled                             :   false                                    
ldt-gc-rate                             :   0                                        
ldt-page-size                           :   8192                                     
master_objects                          :   435390                                   
master_sub_objects                      :   0                                        
master_tombstones                       :   0                                        
max-ttl                                 :   315360000                                
memory-size                             :   4294967296                               
memory_free_pct                         :   99                                       
memory_used_bytes                       :   27864960                                 
memory_used_data_bytes                  :   0                                        
memory_used_index_bytes                 :   27864960                                 
memory_used_sindex_bytes                :   0                                        
migrate-order                           :   5                                        
migrate-retransmit-ms                   :   5000                                     
migrate-sleep                           :   1                                        
migrate_record_receives                 :   0                                        
migrate_record_retransmits              :   0                                        
migrate_records_skipped                 :   0                                        
migrate_records_transmitted             :   0                                        
migrate_rx_instances                    :   0                                        
migrate_rx_partitions_active            :   0                                        
migrate_rx_partitions_initial           :   0                                        
migrate_rx_partitions_remaining         :   0                                        
migrate_tx_instances                    :   0                                        
migrate_tx_partitions_active            :   0                                        
migrate_tx_partitions_imbalance         :   0                                        
migrate_tx_partitions_initial           :   0                                        
migrate_tx_partitions_remaining         :   0                                        
non_expirable_objects                   :   0                                        
ns-forward-xdr-writes                   :   false                                    
nsup_cycle_duration                     :   0                                        
nsup_cycle_sleep_pct                    :   0                                        
obj-size-hist-max                       :   100                                      
objects                                 :   435390                                   
partition-tree-locks                    :   8                                        
partition-tree-sprigs                   :   64                                       
prole_objects                           :   0                                        
prole_sub_objects                       :   0                                        
prole_tombstones                        :   0                                        
query_agg                               :   0                                        
query_agg_abort                         :   0                                        
query_agg_avg_rec_count                 :   0                                        
query_agg_error                         :   0                                        
query_agg_success                       :   0                                        
query_fail                              :   0                                        
query_long_queue_full                   :   0                                        
query_long_reqs                         :   0                                        
query_lookup_abort                      :   0                                        
query_lookup_avg_rec_count              :   0                                        
query_lookup_error                      :   0                                        
query_lookup_success                    :   0                                        
query_lookups                           :   0                                        
query_reqs                              :   0                                        
query_short_queue_full                  :   0                                        
query_short_reqs                        :   0                                        
query_udf_bg_failure                    :   0                                        
query_udf_bg_success                    :   0                                        
read-consistency-level-override         :   off                                      
repl-factor                             :   1                                        
retransmit_batch_sub_dup_res            :   0                                        
retransmit_client_delete_dup_res        :   0                                        
retransmit_client_delete_repl_write     :   0                                        
retransmit_client_read_dup_res          :   0                                        
retransmit_client_udf_dup_res           :   0                                        
retransmit_client_udf_repl_write        :   0                                        
retransmit_client_write_dup_res         :   0                                        
retransmit_client_write_repl_write      :   0                                        
retransmit_nsup_repl_write              :   0                                        
retransmit_udf_sub_dup_res              :   0                                        
retransmit_udf_sub_repl_write           :   0                                        
scan_aggr_abort                         :   0                                        
scan_aggr_complete                      :   0                                        
scan_aggr_error                         :   0                                        
scan_basic_abort                        :   0                                        
scan_basic_complete                     :   0                                        
scan_basic_error                        :   0                                        
scan_udf_bg_abort                       :   0                                        
scan_udf_bg_complete                    :   0                                        
scan_udf_bg_error                       :   0                                        
set_deleted_objects                     :   230946                                   
sets-enable-xdr                         :   true                                     
sindex.num-partitions                   :   32                                       
single-bin                              :   false                                    
stop-writes-pct                         :   90                                       
stop_writes                             :   false                                    
storage-engine                          :   device                                   
storage-engine.cold-start-empty         :   false                                    
storage-engine.data-in-memory           :   false                                    
storage-engine.defrag-lwm-pct           :   50                                       
storage-engine.defrag-queue-min         :   0                                        
storage-engine.defrag-sleep             :   1000                                     
storage-engine.defrag-startup-minimum   :   10                                       
storage-engine.disable-odirect          :   false                                    
storage-engine.enable-benchmarks-storage:   false                                    
storage-engine.enable-osync             :   false                                    
storage-engine.file                     :   /cache/aerospike/data/giata.dat          
storage-engine.filesize                 :   4294967296                               
storage-engine.flush-max-ms             :   1000                                     
storage-engine.fsync-max-sec            :   0                                        
storage-engine.max-write-cache          :   134217728                                
storage-engine.min-avail-pct            :   5                                        
storage-engine.post-write-queue         :   256                                      
storage-engine.scheduler-mode           :   null                                     
storage-engine.tomb-raider-sleep        :   1000                                     
storage-engine.write-block-size         :   1048576                                  
storage-engine.write-threads            :   1                                        
sub_objects                             :   0                                        
tomb-raider-eligible-age                :   86400                                    
tomb-raider-period                      :   86400                                    
tombstones                              :   0                                        
truncate_lut                            :   0                                        
truncated_records                       :   0                                        
udf_sub_lang_delete_success             :   0                                        
udf_sub_lang_error                      :   0                                        
udf_sub_lang_read_success               :   0                                        
udf_sub_lang_write_success              :   0                                        
udf_sub_tsvc_error                      :   0                                        
udf_sub_tsvc_timeout                    :   0                                        
udf_sub_udf_complete                    :   0                                        
udf_sub_udf_error                       :   0                                        
udf_sub_udf_timeout                     :   0                                        
write-commit-level-override             :   off                                      
xdr_write_error                         :   0                                        
xdr_write_success                       :   0                                        
xdr_write_timeout                       :   0                                        
xmem_id                                 :   0                                        
{giata}-query-hist-track-back           :   300                                      
{giata}-query-hist-track-slice          :   10                                       
{giata}-query-hist-track-thresholds     :   1,8,64                                   
{giata}-read-hist-track-back            :   300                                      
{giata}-read-hist-track-slice           :   10                                       
{giata}-read-hist-track-thresholds      :   1,8,64                                   
{giata}-udf-hist-track-back             :   300                                      
{giata}-udf-hist-track-slice            :   10                                       
{giata}-udf-hist-track-thresholds       :   1,8,64                                   
{giata}-write-hist-track-back           :   300                                      
{giata}-write-hist-track-slice          :   10                                       
{giata}-write-hist-track-thresholds     :   1,8,64                                    

    Admin>

grep for write-q in the log file … what does it show?

Yes, you are right. I have replaced the Kingston SSDnow 256GB with Intel 750 SSD NVMe drive for PCIe and the problems go away

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