On 30/09/2021 11:42, Roger Heflin wrote:
On mine when I first access the NFS volume it takes 5-10 seconds for
the disks to spin up. Mine will spin down later in the day if little
or nothing is going on and I will get another delay.
I have also seen delays if a disk gets bad blocks and corrects them.
About 1/2 of time that does have a message but some of the time there
are no messages at all about it, and I have had to resort to using Sar
to figure out which disk is causing the issue.
So on my machine I see this (sar -d):
05:29:01 AM DEV tps rkB/s wkB/s dkB/s areq-sz aqu-sz await %util
05:29:01 AM dev8-0 36.16 94.01 683.65 0.00 21.51 0.03 0.67 1.11
05:29:01 AM dev8-16 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00
05:29:01 AM dev8-32 0.02 0.00 0.00 0.00 0.00 0.00 1.00 0.00
05:29:01 AM dev8-48 423.65 71239.92 198.64 0.00 168.63 12.73 29.72 86.07
05:29:01 AM dev8-64 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00
05:29:01 AM dev8-80 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00
05:29:01 AM dev8-144 2071.22 71311.58 212.22 0.00 34.53 11.37 5.47 54.81
05:29:01 AM dev8-96 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00
05:29:01 AM dev8-128 1630.99 71389.49 198.18 0.00 43.89 15.72 9.62 57.05
05:29:01 AM dev8-112 2081.05 71426.01 182.48 0.00 34.41 11.32 5.42 55.68
There is a 4 disk raid6 check going on.
You will notice that dev8-48 is busier than the other 3 disks, in this
case that is because it is a 3TB disk vs the other 3 being all newer
6tb disks with higher data/revolution.
If you have sar setup with 60 second samples the one disk that pauses
should stand out more obvious than this since the 3tb seems to be only
marginally faster than the 6tbs.
_______________________________________________
In my case the servers /home is on a partition of the two main Raid0
disks that is shared with the OS and so are active most of the time. No
errors reported.
I will try setting up sar with a 60 second sample time on the client,
thanks for the idea.
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