SAN Vmware Speed test?

We are using an EMC Celerra NS-120 connected to ESX 4.0 using mostly nfs and very little iscsi.  We are starting to see some issues with speed and we think it has to do with IO.  How can I go about testing my IO?  I would like to test it and see where I stack against other setups.  Any information on how I can benchmark this to see how slow or fast we are would be great.  Also to know where we should be at for good performance in vmware.

Thanks
LSB-ITAsked:
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andyalderCommented:
How do you test? Might as well use the same as VMware used for http://www.vmware.com/files/pdf/performance_char_vmfs_rdm.pdf (iometer under a Windows VM)
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dblake15Commented:
You could do a windows copy or even fastscp copy and run esxtop to see the disk info
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Danny McDanielClinical Systems AnalystCommented:
get iometer and do various load testing measurements with it.

There's not really a certain level of performance you need to be at for VMware...  It all depends on load and the type of systems that you are running as guests.  Some guests will do more reading than writing to disk, others will be heavier on write loads.  Some may be pretty quiet disk wise, etc...  In esxtop, the quick test is to check storage latency during peak load times.  The lower the number the better, but you typically don't want to see sustained periods above 30MS but 10MS latencies typically indicate that your storage is doing good and you have room for more VM's.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
you could try the VMmark benchmarks if you've got the time to set this up.

another alternative to I/O Meter as mentioned by danm66, if you find it complicated is

DiskTT (Disk Throughput Tester) measures the performance of your harddrive`s read and write function. You can select a folder or drive to test and the program performs a real-time test on the selected disk.

http://www.snapfiles.com/get/disktt.html

SAN Testing
or IOzone (iozone.org).

On a different subject if you are have issues with throughput with NFS, have you enabled Jumbo Frames?
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LSB-ITAuthor Commented:
Thanks everyone,  I did try IOmeter but didnt know how I should setup the tests, and when I got my results didnt know what to compare them against to know if we are running slow or not.  I also tried a few throughput testers on the vm's but was thinking that iops-latency would be what I want to test and not just raw throughput, would you agree?  So by running all of these different tests what would be some good numbers?  We currently have 4 soon to be 6 esx hosts running about 70 vm's.  We are running mostly simple servers running applications, but we are also running exchange 2010 and sql servers.

Thanks
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Could you expand on "We are starting to see some issues with speed and we think it has to do with IO"?

Do you have Jumbo Frames enabled for NFS?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
information on the NFS exports, sizes would be good, as to how you have configured the NAS for all ESX hosts, and have you changed "tweaked" any of the NFS pararmeters on the hosts.
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LSB-ITAuthor Commented:
Our NFS sizes are 800gig, We are thin provisioning the vm's, and we have recently enabled jumbo frames.  We are starting to notice a lot slower bootup, login times.  Also programs are starting to respond slower.  Our esx cpu and memory still look decent.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
How have you configured your Network Interfaces on SAN and ESX hosts? Dual 1Gbe NICs "etherchannled or bonded"?

It could be a bottleneck on NFS or Networking?

What are the statistics on the datastore, disk and write latency?
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LSB-ITAuthor Commented:
It is dual 1gig nic's.  Here is a screen shot of somethin I just changed.  I noticed that the vswitch had the new nic's but when I went to edit the nfs it had one of the adapters set to unused.  I just now moved it up to active.

Untitled.bmp
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
you also need to configure you switch networking correctly, for etherchannel or bonded.

please, investigate latencys on your datastore, if you believe you are having performance issues.
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