Error: Running ACL on aws Provisioned IOPS SSD


Hi There,

Hardware specs: AWS cloud, Amazon Linux, 15GB RAM, 500 Provisioned IOPS SSD , 8 cores ]# ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 120116 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 200000 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 120116 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited

We are trying to run ACL tool on SSD drive, but facing too many read reqs queued after 118sec, please have a look below. ERROR: too many read reqs queued drive(s) can’t keep up - test stopped After 118 sec: read-reqs queued: 99985

What we are missing here, could you please someone help to resolve this.

thanks Murali


i2.4xlarge with an hvm AMZ instance is also a good choice. But as always I would recommend benchmarking the system for your particular case before going live in production.

We do offer an ssd certification tool that can be used to validate your drives:

The Number of ram will deepen don the size of your data as index would need 64 bytes per records.

You can use following links for calculating storage space for your particular data:

For Primary RAM calculation it should be :

64 bytes × (replication factor) × (number of records)

If you have data in-memory you would need to account for that + system overhead in your calculations.