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тАО11-11-2010 01:02 PM
тАО11-11-2010 01:02 PM
EVA4400 performance documentation
I already checked these ones but did not find it
http://h20195.www2.hp.com/v2/GetPDF.aspx/4AA2-0994ENW.pdf
EVA4400 performance white paper 4AA1-8473ENW
I have seen different ITRC posts suggesting a general estimation of 170-200 IOPS for 15K drives and 120-150 for 10K drives.
I am trying to determine a performance baseline of an EVA and to know whether is overloaded or reaching max performance capacity with the current configuration.
EVA4400 w/ dual controllers (09534000 firmware)
4GB total cache
2x Embedded 8GB switches
24x 450GB 15k & 10x 146GB 15K drives.
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тАО11-11-2010 11:27 PM
тАО11-11-2010 11:27 PM
Re: EVA4400 performance documentation
Have you seen this support document?
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01685240
I think together with the "A tactical approach to performance problem diagnosis" paper you referenced above you do have the info you need to get it sorted out.
Cheers
Pete
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тАО11-12-2010 03:53 AM
тАО11-12-2010 03:53 AM
Re: EVA4400 performance documentation
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тАО11-12-2010 02:08 PM
тАО11-12-2010 02:08 PM
Re: EVA4400 performance documentation
Now, should I assume that the 120 and 170 IOPS per disk applies the same way when having VRAID 1,5,6 or how do I figure it out?
Also, about the read and write latencies, should I consider them individually each host port on the EVA or should I do a sum of the reads and a sum of the writes (EVA4400 has 4 ports: 2 ports per controller)
I did a capture with evaperf for a few days, using tlviz, I see in the array an average of 3000 IOPS (total req/s) and peaks on the 6000 IOPS. I see each host port very similar, the read latency averages 20-25ms and write latency 8-16ms. The latencies are over the numbers that HP recommends but the IOPS within the limits from the 5780 max calculated IOPS (2 disk groups, 1 with 24 450GB 15K and the 2nd 10 146GB 15K (1 vraid 5 and the rest vraid6) . Is this still an indication that EVA is overloaded or what other counters should I take in consideration? I am kinda confused here. Thanks
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тАО11-12-2010 02:27 PM
тАО11-12-2010 02:27 PM
Re: EVA4400 performance documentation
Depending on the vRaid level these will be reached with more or less front-end IO.
Pure reads are equal for all vRaid levels.
Example for 1000 IOPS random front-end writes:
on vRaid1 this will caues 2000 back-end IOs
on vRaid5 this will cause >2000 back-end IOs
- Read the original data and parity block (two requests)
- Calculate the new parity block
- Write the new data and parity block (two requests)
For vRaid 6 it will be even more.
Cheers
Pete
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тАО11-15-2010 02:12 AM
тАО11-15-2010 02:12 AM
Re: EVA4400 performance documentation
If it is IOPS you're after, i.e. for an OLTP-style database use:
- As many 15k disks as you can afford
- All disks to one disk group
- Total # of disks divisible by eight i.e. 8, 16, 24, 32,...
- Use only vRAID-1
- check SCSI command queue length
Suggested reading EVA Best Practises docu:
http://h20195.www2.hp.com/V2/GetPDF.aspx/4AA2-0914ENW.pdf
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тАО11-15-2010 05:55 AM
тАО11-15-2010 05:55 AM
Re: EVA4400 performance documentation
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тАО11-15-2010 06:02 AM
тАО11-15-2010 06:02 AM
Re: EVA4400 performance documentation
If you check Fig 1 in http://h20195.www2.hp.com/v2/GetPDF.aspx/4AA1-8473ENW.pdf, the read performance slopes nicely but you should be concerned if you have heavy writes, then you could hit a performance wall. Depends on your read/write ratio, if it's mostly reads, then 4400 will do good, but if you experience high write latencies over a long period (i.e. apart from occasional spikes), then you're in trouble.
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тАО11-24-2010 11:10 AM
тАО11-24-2010 11:10 AM
Re: EVA4400 performance documentation
I've spent the last few weeks doing just what your looking at and have written a tool. If you can get a perfmon log to me I reckon I could spot any performance bottle necks in about 10 minutes.
I'm interested in testing the tool on other peoples machine's perflog data, so we'd both get something out of it.
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тАО11-24-2010 12:41 PM
тАО11-24-2010 12:41 PM
Re: EVA4400 performance documentation
Thanks for the offering, I have a evaPerf capture that it's about raw 650MB/zipped 15MB.
Let me know what do I need to do and what will your tool will do as well.
Thanks