Hi David, I am wondering if that is not what you would expect. The long SMART test is quite thorough so the disc will be subject to quite a bit of stress. Thus, it could well be that the controller is slowing down the rest of the RAID as there is a bottle neck. So from that angle it does make sense to me. This is, however, just speculation from my side.
All the best from a chilly London Jörg Am Montag, 19. März 2018, 16:50:51 GMT schrieb David Mathog: > 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 > mat...@caltech.edu > Manager, Sequence Analysis Facility, Biology Division, Caltech > _______________________________________________ > Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing > To change your subscription (digest mode or unsubscribe) visit > http://www.beowulf.org/mailman/listinfo/beowulf _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
