I've have a question in regards to high disk latency issue in our environment. I've noticed in the past month in our environment that there seems to be high disk latency on one of our ESX server as attached as screenshot1.jpg. When looking a bit deeper I've noticed that there seems to be a high disk latency in kbps as shown on screenshot2.jpg. On screenshot 2 If you look at the graph to me it seems that there's more both high network and disk activity on vm-1 as apose vm-2. I've checked on our san and confirmed that our disk activiy is normal. I'm thinking this might have something to do with our vm's settings with disk allocations, CPU and RAM as appose with the SAN itself because if it was the SAN then this would affect all our other VM's and our ESX servers in our environment. On this ESX server we have the following as shown on screenshot3.jpg:
VM-1 our main file/print server
VM-2 application server
VM-3 OWA server for our exchange 2007
VM-6 email monitoring server
I was thinking that this might be a load balancing issue and to resolve this would be to vmotion our file/print server to another esx box and monitor it's activity to rule out that it is indeed a vm issue not the esx or san issue itself. My question would be is there any other suggestions that would be recommended for resolving this type of issue?
Also please contact me on this discussion board if you require any other graphs for this type of issue or suggestions.
The culprit may down to many reason but I'll go check the VM first before blaming on the storage part. Do this VM is P2ved or fresh install VM, Do you have any snapshot running? Which type of virtual scsi adapter you use?
In answer to this questions, All of our VM's have been P2Ved except our file server. Snapshots are not enabled on our ESX servers but in terms of our equal logics yes we do have them. Can you clarify on some examples of virutal scsi adapters? If you mean the vendor for our iscsi it would be dell equallogic ps4000 model.
So, VM1 wasn't p2ved machine and I assume this VM using LSI loggic scsi virtual adapter right? have you try to storage vmotion to another iscsi target (datastore) and monitor the performance?
moved post to ESX section
You also find me in the support crew of PHD Virtual Backup