Found the problem. Well, sort of.
The issue is that when a long SMART test runs on any disk on the system
(A) which has this problem the IO goes down to 30Mb/s. It doesn't
matter which disk is running the test. The system we have which is most
like it (C) does not have this issue.
A C
Centos 6.7 6.9
RAM 512 512 Gb
CPUs 56 40 (actually threads)
PowerEdge T630 T630
Xeon E5-2695 E5-2650 (both v3)
speed 2.30GHz 2.30Ghz
cpufreq? yes no
PERC H730 H730P
SAS disk ST2000NM0023
SAS disk ST4000NM0005
There are a bunch of small differences between the two systems so it is
hard to say for sure which is the actual culprit.
I will put this out on the smartmontools list and see if anybody has
seen it before.
Regards,
David Mathog
[email protected]
Manager, Sequence Analysis Facility, Biology Division, Caltech
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