[OM Cooker] Problem: SSD drastic drop in hdparm/disk reads.

Tomasz Paweł Gajc tpgxyz at gmail.com
Sun Dec 25 18:19:45 EST 2016


Dnia niedziela, 25 grudnia 2016 16:58:19 CET Ben Bullard pisze:
> Drive in question: Model Family:     Crucial/Micron
> MX100/MX200/M5x0/M600 Client SSDs
> 
> Device Model:     Crucial_CT500MX200SSD4
> 
> Firmware Version: MU04
> 
> Ok, this problem isn't going away. TPG, Colin, Bero, or anyone what logs
> or test/commands in addition to omv-bug-report.log do I need to include
> for a bug report on this. 

Hard to say what may be the problem.
Maybe it's related to aggresive APM on your SATA ports.

tuned daemon may interfere here.

take a look on:
tuned-adm active

then change to diffrent profile:

tuned-adm profile throughput-performance

and then run hdparm tests

> There was a kernel-firmware (20161225) update
> today I hoped would address this but it didn't. 

kernel-firmware has nothing to do with firmware with your disk.


On my SSD Samsung EVO 840 on Lx 3.0 i got stable results:

[root at lazur tpg]# hdparm -t /dev/sda

/dev/sda:
 Timing buffered disk reads: 762 MB in  3.01 seconds = 253.56 MB/sec
[root at lazur tpg]# hdparm -t /dev/sda

/dev/sda:
 Timing buffered disk reads: 778 MB in  3.00 seconds = 259.29 MB/sec
[root at lazur tpg]# hdparm -t /dev/sda

/dev/sda:
 Timing buffered disk reads: 778 MB in  3.01 seconds = 258.63 MB/sec


-- 
Cheers
TPG
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