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Speed NAS Datastorage in ESX 5.0

Posted on 2012-03-10
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Last Modified: 2012-04-13
Hi,

I have a NAS connected to ESX 5.0 (1Gbps) as a datastore for backup purposes.

I have a second NIC only to connect to the NAS, and I enabled jumbo frame (9000 MTU) (In the NAS and in the NIC of the ESX)

But the speed rate is too slow (About 5 MB/s), Have you got any suggestion to improve the transfer speed?

Regards
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Question by:lnrivera
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Expert Comment

by:Gavincr001
ID: 37704448
What's the Make and Model of the NAS?
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Author Comment

by:lnrivera
ID: 37704452
Ctera C400
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LVL 37

Expert Comment

by:Neil Russell
ID: 37704703
What are you using to backup? What are you backing up? VM's or content from inside the VM's?
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Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 

Author Comment

by:lnrivera
ID: 37704725
The question is the speed of the copy process From the main datastore to the NAS datastore of the full VM
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LVL 119
ID: 37704786
check with Jumbo Frames enabled and disabled, Jumbo Frames does not always work well.

What disks are installed in your NAS, SATA? and what RAID are you using?
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Author Comment

by:lnrivera
ID: 37704863
I try with and whithout jumbo frames.

The disk are sata and we use RAID5
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LVL 119
ID: 37704911
RAID10 would give you better performance, but SATA disks do not perform well.
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Expert Comment

by:Neil Russell
ID: 37705649
Your answer is there! SATA.
Using a SATA NAS for datastores is a big NO NO. You are not going to achieve any kind of throughput that approaches anything like a good usable speed while you are using a SATA NAS with Virtualization, sorry.
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Author Comment

by:lnrivera
ID: 37705688
I only want to do a backup
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LVL 119
ID: 37705697
Are you connected via NFS or iSCSI?

iSCSI may give you better throughput?
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Author Comment

by:lnrivera
ID: 37705711
I try with both
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Author Comment

by:lnrivera
ID: 37733761
Maybe the rate speed issue could be related with the RAID stripe size parameters?

Regards
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LVL 119
ID: 37733766
RAID10 may give you better read and write, but SATA disks do not perform well.

now many SATA disks in the RAID set?
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Author Comment

by:lnrivera
ID: 37740435
4
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LVL 119
ID: 37741798
if you are prepared to change to RAID10, this might give you better performance slightly.

But the bottleneck is likely to be the SATA disks.
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Author Comment

by:lnrivera
ID: 37741819
RAID10 is not supported, only RAID 0,1 o 5
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LVL 119
ID: 37741841
looks like you have reached it's maximum performance.
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Author Comment

by:lnrivera
ID: 37783407
Are you sure that 5 MB/s is the maximum speed of RAID5 using SATA disk?
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Accepted Solution

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Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
ID: 37783536
turn OFF jumbo frames, and retest
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