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February 18th, 2014 12:00
VMware SIOC settings for VNX5300
I have a VNX 5300 tiering between EFD/SAS/NL-SAS. I was reading several docs about enabling the VMware SIOC since we just went with VMware Ent Plus 5.1. Some suggestions say set the SIOC to 30 seconds, some say 35 and another blog said 50ms. Which ms setting should I go with initally? If I look at the vnx vmware document it mentions 35-50. Should I go with 35?
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fourmutts
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February 18th, 2014 17:00
Ok, I set the Storage I/O Control to enabled and mode of 90% of peak throughput. I am not running Storage DRS. However, with just running Storage I/O Control, should I disable the Metrics?
o17Uu33DCF12520
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February 18th, 2014 18:00
SIOC uses a latency value called a congestion threshold in milliseconds to define the acceptable latency of the device that supports the datastore type. 30ms is the default value to start with. You can define the threshold per virtual disk according to the datastore type.
Please mark my answer as correct/helpful answer if it helps.
Wolfi72
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April 13th, 2015 04:00
hey,
although this might meanwhile be obsolete, this is from the following document:
https://support.emc.com/docu33753_Using-VNX-Storage-with-VMWare-vSphere.pdf?language=en_US
Cheers Wolfi
CPJ_FL
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April 14th, 2015 13:00
richreitenauer,
When using tiering, don't turn on SIOC and leave it at automatic threshold detection. You want it set for the expected latency from your lowest possible tier. If you leave it at automatic and your IO requests are being serviced from your upper tiers, the moment the array has to dig down to a lower tier and makes the host wait longer than it has deemed 'normal,' SIOC will throttle the VMDKs in that datastore.
The general rule for SIOC with nearline tiers is 50 ms. Any less than that might be too aggressive and cause unnecessary throttling in a datastore that spans that low in the pool.
Regarding your follow-up question, there's no need to disable IO metrics in S-DRS if you aren't using it. However, it never hurts to pre-configure it in case it comes into play later.
~Phil