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I have a server running Microsoft windows server 2012 R2 and it has a very odd problem. Every week on Saturday starting around 8 am the disk reponse time goes up to over 1000ms, every other day of the week this problem does not seem to surface.
I've been trying to find the cause of this issue for a few weeks now but I am not able to pinpoint it.
The server is a:
Dell PowerEdge R410
2x 2.26 Ghz (6 core) Intel Xeon L5460
2X 16 GB DDR 3
Perc h700 raid controller
4x 3TB 7.2K 3.5"
Raid 5 (3 disk) + 1 disk hot spare
The server is running the following roles/software:
Active Directory
IIS
Cache
(Cache is a software package by intersystems)
If any more information is required please let me know
The problem is surfacing at the moment of writing, any help our tips would be highly appreciated.
Looks like patrol read was indeed running and starting at Saturdays at 8am sharp. I stopped it for now, going to keep monitoring the response times (highest at the moment is 15 ms which is great) and change the sceduale to start at Saturday night instead. It looks like the small file acces Cache does (up to 8kb per file io) was not registering with patrol reads "Activity" and it just kept going. It was a feature I had no knowledge of, but it sure seems like it was causing the disk slowdown. You my friend, are a hero – Edo Post – 2018-12-29T09:42:55.810
Also, i was able to configure patrol read through the perc cli – Edo Post – 2018-12-29T10:07:30.623