alexander_foti1
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Odd I/O and CPU performance on client

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 1Raid 1

Raid 50

Raid 60Raid 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:

icmp.JPG

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)disk.JPG

cpu.JPG

Here is a screenshot of Task manager when a backup is running (high io to both Datastores/Raid's)

tskmgr.JPG

 

Any input would be much appreciated. 

 

 

 

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