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тАО08-11-2009 10:42 PM
тАО08-11-2009 10:42 PM
Considering an EVA 8100 (or any EVA with active-active capability) and an HP-UX 11iv3 server what would be the best design principle in order to maximize storage access performance (IOPS and BW), to use 1 vdisk of 500GB (LVM: 1 PV in 1 VG with with single or multiple LVs) or 5 vdisks of 100GB (LVM: 5 PVs in 1 VG with single or multiple LVs) ?
I think that since the server has 2 dual-port HBAs (dual-fabric SAN), the OS supports native multipath, the storage supports active-active, the best idea is to be able to use the parallelism at any level given multiple IO operations, thus I would adopt the latter ...
I would appreciate any opinion/suggestion eventually doc.
Thank you
L.
Solved! Go to Solution.
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тАО08-11-2009 11:22 PM
тАО08-11-2009 11:22 PM
Re: Multiple LUNs vs single LUN in HPUX 11iv3
I would use multiple paths and disks to get the benefits of lvm striping and using both controllers/caches.
Remember that the EVA use multiples of 8 for expansion and the good old binary system.
For example 4 Paths 8 Disks 64GB sounds nice.
Some Hands on for the EVA:
http://h20195.www2.hp.com/v2/GetPDF.aspx/4AA0-2787ENW.pdf
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тАО08-12-2009 10:38 AM
тАО08-12-2009 10:38 AM
Re: Multiple LUNs vs single LUN in HPUX 11iv3
If said disk is to be used under ASM in a Oracle - I will sugegst for say 5x100GB Vdisks and path prefrenced alternating between A and B controllers. That way you fully harness the bandwidth to your EVA and the dual controllers.
But you can also do a comparative performance since it is quite EASY to colapse and ercarve VDISKS (LUNS) on an EVA.
I suggest you use ORACLEs ORION Tool which is very easy to use and simulates comparative IO and even striping that happens in ASM. The tool is at:
http://www.oracle.com/technology/software/tech/orion/index.html
Let us know your results.
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тАО08-13-2009 12:08 AM
тАО08-13-2009 12:08 AM
Re: Multiple LUNs vs single LUN in HPUX 11iv3
Well, unfortunately Orion testing is not an option so far, since I am talking about a production environment (and the latest tests I ran, with IOmeter, turned the storage unresponsive). ASM is also not used now. But for sure I appreciate your idea.
After reading the HP whitepaper svo suggested, I draw a conclusion , and I would appreciate any comments on this : page 22 (controller balancing influences performance): I would split the disk-group in 5 vdisks (LUNs) in order to have flexibility in balancing the workload. But the following phrase can ignore all your plans :
"HP Continuous Access EVA requires that all LUNs within a DR group be owned by the same controller. Load balancing is performed at the DR group level and not the individual LUN. Additional configuration information can be found in the HP StorageWorks Continuous Access EVA implementation guide."
Thus the flexibility is reduced when using Continuous Access.
As an example : if one has 2 applications each needing 500 GB space; and it has a DR group for each , then it makes no sense to split each 500GB in 5 LUNS since all of them will be owned by the same controller.
Another note, stating that there is no performance improvement when splitting on the same controller:
Striping LUNs within a disk group on the same controller provides no additional performance value. The EVA automatically stripes each LUN across all disks in a disk group.
Since the discussion turned to somehow a storage design issue (well they are very much related , and I'd be glad to have here members with experience in both domains), I would like to ask what do you think about my question from the LVM point of view ? I refer here at your experience in balancing filesystem access for performance improvement. Logical Volumes stripped or not ?
Thank you.
L.
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тАО08-13-2009 02:22 AM
тАО08-13-2009 02:22 AM
Re: Multiple LUNs vs single LUN in HPUX 11iv3
in my opinion you will only get a final answer by testing and comparing the results.
Following the whitepaper splitting and stripping doesn't make sense, so the only reason to use lvm will be the flexibility if you need to change it (increase, .. ).
In our enviroment we use EVA's as described above, even if we don't get, according the whitepaper, benefit of it.
If you look at http://communities.vmware.com/thread/73745 - these guys tested a lot of EVA's with iometer without any problems, so perhaps you give it a second try.
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тАО08-13-2009 03:21 AM
тАО08-13-2009 03:21 AM
Re: Multiple LUNs vs single LUN in HPUX 11iv3
Am I right , or is it just my imagination ?
Thank you.
L.
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тАО08-18-2009 10:45 PM
тАО08-18-2009 10:45 PM
Re: Multiple LUNs vs single LUN in HPUX 11iv3
I also use LVM, multipathing, mirroring, ... and noticed that HP-UX as an IO queue per LUN.
So, if you have 1 big lun of 500GB, all IO is done sequentially. If yo have 5 luns of 100GB, 5 IO's can be done in parallel. So, in theory, you can flush your IO to the EVA's NVRAM 5 times faster with 5 LUN's as with 1 LUN, provided that your IO-card is not a bottleneck and the EVA's disk can keep up with the IO throughput.
Reading is the same 5 reads can be done in parallel, but at the bottom line, the EVA has to get the data from the same set of disks, so if the EVA itself is heavily loaded, it probably won't make any difference.
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тАО08-18-2009 11:22 PM
тАО08-18-2009 11:22 PM
Re: Multiple LUNs vs single LUN in HPUX 11iv3
Liviu.
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тАО08-19-2009 05:54 AM
тАО08-19-2009 05:54 AM
Solutionhttp://www.oracle.com/technology/deploy/performance/pdf/EVA_ORACLE_paper.pdf
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тАО08-19-2009 07:31 AM
тАО08-19-2009 07:31 AM
Re: Multiple LUNs vs single LUN in HPUX 11iv3
Anyway I still have to understand the stripe size LVM mechanisms and the fine tuning according to different data types.
L.