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35846
July 18th, 2012 01:00
PS6100XS hybrid array, IOPS/load
Hi.
I bought a Ps6100XS to drive our Citrix Xenapp volumes from, giving that the SSDs should provide great IOPS. I am not seeing any problems, but i am puzzling the rather low estimated IO that SANHQ says the array has.
Given that the array has 7 SSDs and17 harddrives, i somehow expected more than a maximum IO rate of 1365IOPS.
Is it an SANHQ problem (not fully supporting the newer arrays), or am i really seeing close to 100% load at such a rather low load.
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pearce_jj
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July 18th, 2012 04:00
It's because the workload has shifted to scattered writes, since under the glitz it's 'only' a 7-drive RAID-6 array, so it has very limited sustained random write performance. Notice also that the write workload shows up as *read* latency due to the caching.
pearce_jj
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July 18th, 2012 08:00
Well now almost all your workload is writes! Can you post the disk load info (fig.7 on pg.16 in that doc)?
Christian Hanse
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July 18th, 2012 08:00
Im not really sure that i understand the concept of scattered writes :-)
I looked through the following document, that talks about especially VDI projects, on hybrid arrays:
en.community.dell.com/.../2642.sizing-and-best-practices-for-deploying-vmware-view-vdi-with-equallogic-storage-by-sis.aspx
the IO pattern of XenApp and VDI should be very similar.
Admittedly they do not show the Full graphs in the report/commercial.
Since my first post actually included a screenshot of mostly IO during the night, i have added a new picture below, that shows the IO over a day. 8 in the morning to 16
Christian Hanse
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July 18th, 2012 09:00
Sure can.
sorry im a bit limited on the resolution of my laptop, so i had to cut a few of the harddrives out, but the IO on them is the same more or less.
pearce_jj
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July 19th, 2012 01:00
That is odd, although the throughput had dropped by then none of those drives look more than 5 to 10% loaded. Have you opened a support case?
Christian Hanse
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July 19th, 2012 02:00
No i kinda wanted to hear peoples opinion before wasting support time on it :)
pearce_jj
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July 19th, 2012 03:00
Don't be afraid to use support - you've paid for it!
Christian Hanse
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July 19th, 2012 04:00
I know, but my time is limited ;)
Ed Kammerling
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November 20th, 2012 05:00
I should open a support case, you're disk queue depth is way to high