Re: RX2800 sporadic disk I/O slowdowns

On 10/21/24 10:45 AM, Richard Jordan wrote:

On 10/18/24 5:09 PM, Craig A. Berry wrote:

>
On 10/18/24 1:26 PM, Richard Jordan wrote:

Monitor during a long run shows average and peak I/O rates to the disks with busy files at about 1/2 of what they do for normal runs.

>
That is exactly what happens when the cache battery on a RAID controller
dies.  Maybe yours is half-dead and sometimes takes a charge and
sometimes doesn't?  MSA$UTIL should show the status of your P410.

 Initial check shows all good on the controller.  No disk, battery, cache, etc issues.  I may add snapshotting the controller status via MSA$UTIL to one of the other polling jobs in case battery or cache status is varying.

Yeah, it would be good to gather whatever info you can *while* the poor
performance is happening.  It could be a lot of things, but with a
device that's designed to recover from or compensate for errors, looking
at after it's recovered from whatever is bothering it may not help much.