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Throttle host IO from backend
Is there a way to throttle host IO on the backend ? We have a datawarehouse that does a dump every night. Rest of the day the ios are minimal.
But during the dump, the host causes the WP pending to touch 90% thereby affecting overall symmetrix performance.
20 devices occupy almost all of the cache slots (upto 5% each) ..
sauravrohilla
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February 14th, 2012 05:00
you can think about Dynamic Cache partitioning or QOS...
midsan
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February 14th, 2012 06:00
Thanks Suarabh...
We are looking at DCP. BTW, is it possible to QoS thin devices (non BCV, non SRDF)
Quincy561
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February 14th, 2012 09:00
There isn't any QoS that will help with this case. DCP is a perfect solution, however if the box is VP (thin), don't let the target value on the Default partition get too small. I recommend no smaller than 50% for the default. The partition you are putting these dump devices in should be small anyway, around 10% target value should work well.