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02-17-2012 11:04 AM
02-17-2012 11:04 AM
VSA disk planning
I've been running into some performance issues with my software VSA nodes running on hyper-v. The systems are under-spec for spindles as is so I want to make sure i"m not eating up needless IOs through my configuraion between disk/raid/NTFS/iscsi/NTFS stripe/block sizes.
Here is the setup:
Disk Sector Size: 512b
Hardware Raid5 stripe: 128k
NTFS cluster size on Hyper-V computer: 64k
HP VSA: ?????? I don't know what it is
iSCSI target LUN cluster size: 64k (the cluster size for my hyper-v CSV LUNs)
.VHD files on CSV drives: mixed between 4k clusters for OS drives and 64k for storage/app drives.
I was talking with the raid card vendor and they suggested 64k for their stripe size works best for their system.
I feel like cluster/stripe size is something that is rarely talked about and thought I woudl poll the group to see what others are doing and if there are any suggestions. I'm tempted to try using 64k throughout or do 64k hardware and 4k for the rest, but I"m worried about alignment issues. I was told by the raid card mfg that it isn't an issue for the hardware level.
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02-17-2012 11:54 AM
02-17-2012 11:54 AM
Re: VSA disk planning
From what I've been told by HP support, which must be taken with a grain of salt, the P4000 stripe size is 64k.
I would strive to use 64k on the hardware side, with that in mind.
For the guest OS side, I use 64k for servers that are doing large IO, and I don't worry about it for the others.
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02-17-2012 05:26 PM
02-17-2012 05:26 PM
Re: VSA disk planning
That is what I've been thinking lately. my concern is with allignment... if the sizes are the same and they aren't alligned then that means you are doubling the IO load 100% of the time.
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08-26-2012 05:11 AM
08-26-2012 05:11 AM
Re: VSA disk planning
Hi,
Just wondering if you had any perfromance results during your stripe size testing? Did you go for 64K on the raid card in the end?
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08-26-2012 12:51 PM
08-26-2012 12:51 PM
Re: VSA disk planning
I was looking for this thread to update :)
I ended up going with 256k stripes on my raid card because it seemed to work the best with my LSI raid cards. I also directly presented the drives to the VM so I didnt' have to deal with figuring out the best NTFS cluster size. and I don't have to worry about extra free space on the drive that houses the vhd.
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08-27-2012 02:42 PM
08-27-2012 02:42 PM
Re: VSA disk planning
David Tocker
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08-27-2012 09:50 PM
08-27-2012 09:50 PM
Re: VSA disk planning
You can refer to the HP Guided troubleshooting tree for VSA planning and for some issues on the left hand networks
http://h20584.www2.hp.com/hpgt/guides/select?lang=en&cc=us&prodTypeId=12169&prodSeriesId=4118659
Select option VSA planning and installation and getting started with the Centralized Management Console (CMC)
PS
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08-29-2012 06:27 AM
08-29-2012 06:27 AM
Re: VSA disk planning
If you use the CLIQ and run the getvolumeinfo command, the reported block size for the SANiQ volumes is 1024k. My system is in VMware, so I'm not sure if that changes using Hyper V.