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Hi all
I have been having odd performance issues on an ESX 6.0 host.
In particular with one VM.
The host is a Dell R515 with PERC H700 raid controller. 12 6gb/s SAS 3.5" disks in a Raid 10 and 2 identical disks in a Raid 1
6 core Opteron 4180 CPU X 2 and 64GB of RAM
Each Raid has its own Datastore on it.
The Virtual machine has one 18TB Thick provisioned Virtual disk (Raid 50 Dstore) and one 1 TB Thin provisioned virtual disk (Raid 1 Dstore).
The Raw IO performance testing on these disks is pretty good:
Raid 1
Raid 1
Raid 50
Raid 60
The issue comes when you put lots of IO on any of them. The VM performance slows to a crawl. (Server 2012 R2). Its system process takes up half the available CPU% and local ICMP Replies from another machine on the Lan increase from <1ms to 100-800ms:
I don't feel that the ESXTOP outputs for storage and CPU neccearily represent a problem, although I feel %VMwait is a tad high (although 16x VCPUS)
Here is a screenshot of Task manager when a backup is running (high io to both Datastores/Raid's)
Any input would be much appreciated.