Memory errors

[kporter]

@matijav

Jun 29 2017 09:14:37 GMT: INFO (drv_ssd): (drv_ssd.c:2118) {realtime} /dev/sdd: used-bytes 145150033408 free-wblocks 157520 write-q 0 write (25288648,0.0) defrag-q 0 defrag-read (24980403,0.0) defrag-write (12250503,0.0) Jun 29 2017 09:14:37 GMT: INFO (drv_ssd): (drv_ssd.c:2118) {realtime} /dev/sdc: used-bytes 145125398912 free-wblocks 158002 write-q 0 write (25257368,0.0) defrag-q 0 defrag-read (24949853,0.0) defrag-write (12235755,0.0)

You are running very close to stop-writes-pct:

bytes_used / ((free_wblocks * wblock_size * 1kb) + bytes_used) = fraction_used
145150033408 / ((157520 * 128 * 1024) + 145150033408) = ~0.875

I suspect that it must have breached during this event.

BTW you are also really close to min-avail-pct as well.

@matijav

Jun 29 2017 09:14:37 GMT: INFO (drv_ssd): (drv_ssd.c:2118) {realtime} /dev/sdc: used-bytes 145125398912 free-wblocks 158002 write-q 0 write (25257368,0.0) defrag-q 0 defrag-read (24949853,0.0) defrag-write (12235755,0.0)

Defrag isn’t doing anything in this snapshot for a 10 second window, but this isn’t unexpected since the write rate is also 0. If your write rate is generally low then you may want to increase defrag-lwm-pct to 65 (be aware that this will result in write amplification which increases non-linearly to value of defrag-lwm-pct).