Recommendation for size VMDK for IO Analyzer test vsan

Hello

Is there a size Analyzer IO Vmware VMDK recommendation? When deploy you from the model of the test is performed on the second disc of 100 MB. I saw a few recommendations to remove this second disc and add a great new.

Analyzer 01-100MB on disk, I get 12000 IOPS / s, 45 Mbit/s on a random test of 4k_70% read_80%.

Analyzer 02-100 GB drive, I have 1300 iops, 5 Mbps on a random test of 4k_70% read_80%.

Caching is disabled on all drives and controllers (HP P420i). 3 x HP DL380 (200SSD, 5 x 900 10kSAS).

I'm surprised the difference that both drives should reach the 200 GB ssd. Or analyzers from writing to disks are formatted with any FS. Obviously, the second machine with the largest disk not reading so that lower iops cache hits is but I don't know why, as are big enough SSDS.

Thank you

Remember, VSAN is all about having your work in cache, so that most of the readings reached the level of flash cache.

It seems that monitor 1 with 100MB is mainly in the cache, while 2 parser is not.

We are working on a guideline that the working set of an application is usually 10% of its capacity. It is sometimes more, sometimes less is, but 10% is a generally accepted rule.

I don't know how the Analyzer has been configured, but it is the workload it contains repeated data profiles, while some cached data can be read?

If this is not the case, this may mean that you are simply fill the SSD write buffer, it disabling the disk rotation when it reaches a particular threshold, then fill again. This means that you are bound by disk magnetic performance and get very little by way of benefit from caching layer of VSAN.

Things to look at:

1. is Analyzer using 100 GB just like its working set, and cela will reflect your production workloads? If this isn't the case, reduced to a size that is the reflection of a real production working together? If most of your VMS use 100 GB VMDK, consider a set of 10 GB size work.

2 Analyzer uses patterns to repeat? If not, configure it to do this, or use another tool of reference that makes.

HTH

Cormac

Tags: VMware

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