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ReadyNAS 3100 iSCSI'd to ESX 4.1 vCenter, very slow
I am experiencing very slow VM's performance when using the ReadyNAS 3100 (4.2.17) as a iSCSI Datastore on my VM's. ESX 4.1 + vCenter 4.1 + ReadyNAS 3100 in private environment. I have my ESX VMKern...
If you haven't already, take a look at this page:
http://virtualgeek.typepad.com/virtual_ ... phere.html
It was written for/by EMC and NetApp, but most of the theory still applies.
If it were me, I'd be tempted to run iometer on a single VM, and see what kind of rate (IOPs - Cmd's / second) and bandwidth (MB/s) you are pushing, and at what latency (DAVG)
As a SUPER general rule of thumb, you'll want your DAVG counters (from esxtop , then d for disk mode) to be <20 for good performance. I like to see <10. Over 50 and you'll start to notice "slowness"
And lastly, try Windows 2008, I believe it is automagically aligned, for more information on performance best practices, please see here:
http://www.vmware.com/pdf/Perf_Best_Pra ... ere4.0.pdf
Welcome, and good luck :)
http://virtualgeek.typepad.com/virtual_ ... phere.html
It was written for/by EMC and NetApp, but most of the theory still applies.
If it were me, I'd be tempted to run iometer on a single VM, and see what kind of rate (IOPs - Cmd's / second) and bandwidth (MB/s) you are pushing, and at what latency (DAVG)
As a SUPER general rule of thumb, you'll want your DAVG counters (from esxtop , then d for disk mode) to be <20 for good performance. I like to see <10. Over 50 and you'll start to notice "slowness"
And lastly, try Windows 2008, I believe it is automagically aligned, for more information on performance best practices, please see here:
http://www.vmware.com/pdf/Perf_Best_Pra ... ere4.0.pdf
Welcome, and good luck :)
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