[Info-vax] RX2800 sporadic disk I/O slowdowns

[Richard Jordan]

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.

The long-run occurred again, another Monday in a row. I haven't had time 
to review our diagnostic polling yet to see if any different jobs or 
user stuff was running concurrently but will shortly.

I'll take a look at T4; its been more than a decade since we tried using 
it on a customer system.

Thanks