Certainly your latency numbers are off the charts. But what is so strange to me is the magnitude of this latency given how little IO traffic you're seeing. Single digit IOPS are insignificant.
What does the array its service time is? Are you seeing the same latency to the same volume from other ESX hosts? How is the storage configured for the volume showing those high latencies?
it's interesting that your graphs do not show that many IOPS, so could it be that other systems (non-VM) are using the same RG and generate a lot of workload ?
orcsab
12 Posts
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August 7th, 2012 22:00
Certainly your latency numbers are off the charts. But what is so strange to me is the magnitude of this latency given how little IO traffic you're seeing. Single digit IOPS are insignificant.
What does the array its service time is? Are you seeing the same latency to the same volume from other ESX hosts? How is the storage configured for the volume showing those high latencies?
Scott
0HNOWaQdsD11671
1 Message
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August 7th, 2012 23:00
Do you use iSCSI or FC?
I have seen this kind of latency with iSCSI and then the problem was with iSCSI adapter.
tdubb123
470 Posts
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August 11th, 2012 15:00
hi
this is a pretty large sata rg with a lot of luns on it. I am using fc.
could it be because I have too many luns on the rg and the drives are slow?
dynamox
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20.4K Posts
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August 12th, 2012 16:00
do you have navi analyzer ? If yes, what does it show you for Response time and Total IOPs for that LUN ?
tdubb123
470 Posts
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August 12th, 2012 18:00
no i dont have that. i have generated naz files and sent them to support. they said my sata drives are too slow and only capable of 80 iops
dynamox
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20.4K Posts
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August 12th, 2012 19:00
it's interesting that your graphs do not show that many IOPS, so could it be that other systems (non-VM) are using the same RG and generate a lot of workload ?
sullybags
45 Posts
0
August 13th, 2012 02:00
you would need to check with esxtop & compare with nar data.
perf. reporting (latency) on esx5 does not work: (which also implies any other reporting tool sitting on top of vcenter...)
http://kb.vmware.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&externalId=2012309&sliceId=1&docTypeID=DT_KB_1_1&dialogID=289804019&stateId=1%200%20289982769
you can capture the esxtop output to .csv if required:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1033346