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vms reporting disk latency
I got a group of vms on different luns but luns are created from the same rg.
there are certain times during the day when all the vms on these luns would shows red alarms and its disk latency
looking at it from the vsi plugin, one of the luns shows
%Busy maximum is 50.13
avg: 34.35
is there a problem?
mattcowger1
61 Posts
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July 17th, 2012 12:00
Well, its very likely that you are overloading the RG....
tdubb123
470 Posts
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July 17th, 2012 22:00
the rg i have is 14disk on 1 enclosure. raid5. all sata1 disks 500gb.
its a 6.5TB rg with 14luns on it.
is there away to check performance on the whole rg?
tdubb123
470 Posts
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July 17th, 2012 22:00
the vsi does not show any stats on read and write latency. why is that/
RRR
5.7K Posts
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July 18th, 2012 04:00
Navisphere Analyser should be able to help you. You can check the performance of RAID Groups as well as individual LUN's (and SPs, ports, whatever you'd like to see in such a tool)
tdubb123
470 Posts
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July 18th, 2012 06:00
just shows this
1 Attachment
image001.png
cris_danci
39 Posts
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July 18th, 2012 06:00
Right mouse click the array ->properties -> Software
Is it listed?
LeeMC2
25 Posts
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July 18th, 2012 06:00
There are a few important points to note here:
1) VSI will show only show latency values for RAID group LUNs, but not pool LUNs. For pool LUNs, %Busy is shown instead. So are you certain that you are working with an RG and not a pool?
2) There are known problems with VMware's disk latency alarm. Please take a look at these:
http://communities.vmware.com/thread/331651
http://communities.vmware.com/message/1513613
You may in fact find that nothing is wrong, but the alarm is incorrectly triggering.
Lee
cris_danci
39 Posts
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July 18th, 2012 06:00
I agree with RRR, use analyser to determine if the array has latency and work outwords from there. It could be an issue somewhere else in the I/O path or in VMware.
tdubb123
470 Posts
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July 18th, 2012 06:00
right clicking on the SP in navisphere and going to navisphere analyzer its grayed out .does that mean I dont have it installed?
tdubb123
470 Posts
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July 18th, 2012 07:00
how do i install analyzer onto the array?
cris_danci
39 Posts
0
July 18th, 2012 07:00
It needs to be purcahsed.
Alternatively, log a call with support. With FLARE 26 you can generate NAZ performance files without an analyser license. Support can read these files and give you "some indication".