We recently did some NetApp DOT upgrades. Everything went smoothly.
Since then, one of our application development teams has started to report poor performance. We investigated all troubleshooting possibilities that we can think of - Windows servers layer, esxi host, storage and networks etc but to no avail. We've also engaged the software vendor and they have confirmed the app and db are adequately resourced. We also have a DBA investigating for us also.
One thing the application owner did mention is that performance started to degrade around Monday the 20th of July. Coincidentally or not, we did the Netapp DOT upgrade on the weekend of 18th/19th.
The performance issues may not be linked at all but I just wondered if any others had experienced similar issues?