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тАО08-01-2009 08:05 PM
тАО08-01-2009 08:05 PM
Running multiple VSAs in the same ESX Host
Thanks in advance,
Andres
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тАО08-03-2009 12:07 AM
тАО08-03-2009 12:07 AM
Re: Running multiple VSAs in the same ESX Host
e.g. if you want to share out more than 10TB of local storage you will need more than one VSA.
You will be required to create individual VMFS volumes for assigning disks to the VSA e.g. 2TB VMFS to 2TB VMDK for VSA.
I'm not sure why they state this restriction in the VSA, you could occasionally share them if you create disks smaller than 2TB - but it's not supported per the documentation.
Regards
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тАО08-03-2009 07:58 AM
тАО08-03-2009 07:58 AM
Re: Running multiple VSAs in the same ESX Host
Thanks for your reply, could you tell me what document mentions that it is not supported in production?
tks
Andres
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тАО08-04-2009 04:35 AM
тАО08-04-2009 04:35 AM
Re: Running multiple VSAs in the same ESX Host
About running more than one VSA on the ESX host i cannot find anywhere, just remember that a guy from LeftHand did not recommend doing this.
About sharing VMFS volumes with other machines is printed in the VSA user guide.
Regards
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тАО08-04-2009 05:25 AM
тАО08-04-2009 05:25 AM
Re: Running multiple VSAs in the same ESX Host
1- Is two VSA on the same VMFS datastore supported.
No, it is not as stated in the manual. The reason is that when VMs of any type, including VSA, are on the same datastore they each mush lock and unlock the storage repeatedly. Putting two SAN VMs (The VSA) on the same datastore causes so much locking and unlocking that performance degrades too much.
2-Is multiple VSAs on the Same ESX server supported.
Yes, but is not a best practice. There are few cases that this makes sense, but when it does we do support it. A few customers are actually running this way in production.
The reasons are usually around building some test/dev/lab environment or some special disk / data layout where it makes sense. The thing to be very wary of though is putting VSA on the same ESX cluster that are in the cluster or are both "managers" in the same management group. Essentially the fear is that you'll build a configuration where the reboot or loss of one ESX server takes down enough of the right (or is it wrong?) VSA causing data to go offline at a time you did not expect.
I hope that helps.
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тАО08-04-2009 06:21 AM
тАО08-04-2009 06:21 AM
Re: Running multiple VSAs in the same ESX Host
I'm also unsure of the official HP support policy regarding RDM. From all the performance docs VMware released about rdm vs vmdk I expect to see little difference (IOP-wise), although none of there tests were using a virtual san product, more database or streaming tests, and their published results were on ESX 3.5.
I'd like to hear if anyone else has done any VSA testing on RDM.
I also noticed some better IOPs after applying the patch (10050) that brings the vmware tools to the latest version.
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тАО08-04-2009 07:59 AM
тАО08-04-2009 07:59 AM
Re: Running multiple VSAs in the same ESX Host
What for?
The VSAs are not constantly being powered on/off, the VMDKs are not changed, no snapshots etc. The only meta-data changes I anticipate are due to maintaining the VM's logfiles.
I understand that no datastore sharing is allowed to prevent another VM from 'stealing' I/O capacity.
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тАО08-04-2009 01:35 PM
тАО08-04-2009 01:35 PM
Re: Running multiple VSAs in the same ESX Host
Teledata - I'm not sure why you want to use RDMs for this (i'm actually not sure if it's supported by the VSA) - But performance wise you will gain little or not even noticeable performance gains.
Regards
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тАО08-05-2009 11:42 PM
тАО08-05-2009 11:42 PM
Re: Running multiple VSAs in the same ESX Host
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тАО08-06-2009 10:41 AM
тАО08-06-2009 10:41 AM
Re: Running multiple VSAs in the same ESX Host
RDM - If you can I'd do it but without much expectation of higher performance. Really I'd just do it because conceptually it is simpler and you are eliminating an unnecessary layer of virtualization.
Shared VMFS / volume locking - Expanding on the reason we don't like the VMFS being shared with other VMS... It's true that the VSA probably won't lock the volume often because the VSA should not be rebooting often or doing vmotion. The real concern is that we don't know that about the other VMs you might put on the volume with the VSA. If you put 4 other VMs on the same VMFS as the VSA,and those other VMs reboot or vmotion often (perhaps due to DRS) then the VSA will experience IO pausing whenever those VMs lock the datastore. So I'm not concerned about the VSA hurting the other VMs performance, I'm concerned about the other VMs stealing performance and locking the vmfs and hurting the VSA.
And honestly, my concern might be more out of fear then reality. I just say that because I've only actually seen one field issue where other VMs on the same datastore were messing up the VSA performance and moving the VMs off the VSA's same datastore solved this issue.