VmWAre DataStore performance questions


I have attached a capture with DataStores and their current performance metrics.

I would like to get some help analyzing them. Are there any articles that I can look at in order to determine what is considered to be something with a good, decent or bad performance so that I can categorized them and pin point the ones that are suffering the most.

Each DataStore is formed by an individual LUN.

Thank you.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
llaravaAuthor Commented:

For the following metrics

Average Throughput
Peak Throughput
Average IOPS
Average Latency
Peak Latency

what would be considered good reference values and why?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I would need to have the details of your SAN/RAID for comparison, and also what tools you used to establish these results.

because here are some results from a simple SAN we have

just as an example of 5,400 rpm SATA disks, not on a particular fast system

two disks - 84.5 MB/s Write,  150 MB/s Read
four disks - 196 MB/s Write, 276 MB/s Read
eight disks - 212 MB/s Write,  287 MB/s Read

In comparison to your table, your results are very poor, compared to eight SATA, 5,400 disks!
llaravaAuthor Commented:
Everything you see there is sitting in SATA 7200 RPM disks RAID 5
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Okay, I would expect performance of that nature, with 7,200 SATA, and RAID 5.

RAID 5 does not perform well, under write, because of the write penality, and you would be luck to get 40 IOPS of each SATA disk.

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