2012R2 Server POSE w/2 VOSE

Have a 2012R2 server in the following environment:

POSE: Dell PowerEdge T610, RAID5, 32G memory, E5620 Processor, Hyper V Host / File server (2012 r2 server)
VOSE1: PDC (2012 r2 server)
VOSE2: Exchange 2013 Server (2012 r2 server)

About every 45 - 50 days the server slows down substantially, continues to work but crawls along extremely sluggish. One noticeable condition is VOSE2 CPU increases to 35 - 40% from 5 - 9%.

Anyone seen this behavior? Have any recommendations and ideas what may be happening.
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WORKS2011Managed IT Services, Cyber Security, BackupAsked:
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
How many disks in the RAID 5? Is there a battery backup connected to the RAID controller? is it healthy if yes?

Check the Processes tab to verify what is causing it but probably an Exchange clean-up task is running.

I suggest RAID 6 as a starting place for any virtualization disk setup with hardware RAID and non-volatile or battery backup cache. Just do a search for "punctured stripe" to get an idea as to why.
Do both guests leave enough RAM to satisfy minimum requirement of host?
WORKS2011Managed IT Services, Cyber Security, BackupAuthor Commented:
Do both guests leave enough RAM to satisfy minimum requirement of host?
If I understand correctly  it's 25% of overall ram for the exchange server is this correct? Do you have specifics which each host should be from the overall 32G.

@Phillip Elder: will research RAID6 and punctured stripe. I can't recall what the service was running last night off hand, it had to do with fast searching in exchange, interesting you mentioned exchange. I'll find out what the service was and let you know.
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2-4GB min for each of 3 machines, i.e 28GB max for both guests.
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
We configure vRAM to Physical RAM - 1.5GB.
We configure a static swap file of 4192MB on C: for the host (no swapping needed)

Exchange 2013 is designed to run in RAM with very little actual I/O to the disk subsystem. It can, in fact, run a very substantial number of mailboxes on a very small disk set so long as there is RAM available for it to work with.

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That was the next step... First we need to make sure no swapping in host, then we dig on guest performance...
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Windows Server 2012

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