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|FC-10k tier has disks exceeding low water mark of recommend.
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|Author:||walter_white [ Thu Jul 19, 2018 1:59 pm ]|
|Post subject:||FC-10k tier has disks exceeding low water mark of recommend.|
So InfoSight reported this alert:
"FC-10k tier has disks exceeding low water mark of recommended IOPS"
3Par is a 7200 with 28 10K FC disks.. The low IOPS threshold is 150 while the high is 250.. NinjaStar has it getting 3,000 I/O. All VV are RAID5..
Running statvv throughout the day sees averages around 1,500 IO with a few high spikes and a few low as well..
Is this alert telling me that the SAN is trying to push more IO but the disks are only giving it <100 when they should be giving over 150??
|Author:||ailean [ Wed Jul 25, 2018 8:34 am ]|
|Post subject:||Re: FC-10k tier has disks exceeding low water mark of recomm|
If it's only some disks it might be a hotspot, maybe one particular LUN with heavy writes keeping the same few disks really busy.
Maybe try looking from the other side, statpd to find the busy disks.
If it is a hot LUN maybe move to a SSD tier if available or QOS it if it's not important.
I've got a few hot disks but the cause was easy to find, couple of LUNs doing 7.5k iops of writes, which of course they mirror.... but can the OS/App teams figure out what it is or why it's doing it.....
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