Speed NAS Datastorage in ESX 5.0

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
lnriveraAsked:
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Gavincr001Commented:
What's the Make and Model of the NAS?
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lnriveraAuthor Commented:
Ctera C400
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Neil RussellTechnical Development LeadCommented:
What are you using to backup? What are you backing up? VM's or content from inside the VM's?
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lnriveraAuthor Commented:
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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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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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lnriveraAuthor Commented:
I try with and whithout jumbo frames.

The disk are sata and we use RAID5
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
RAID10 would give you better performance, but SATA disks do not perform well.
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Neil RussellTechnical Development LeadCommented:
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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lnriveraAuthor Commented:
I only want to do a backup
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Are you connected via NFS or iSCSI?

iSCSI may give you better throughput?
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lnriveraAuthor Commented:
I try with both
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lnriveraAuthor Commented:
Maybe the rate speed issue could be related with the RAID stripe size parameters?

Regards
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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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lnriveraAuthor Commented:
4
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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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lnriveraAuthor Commented:
RAID10 is not supported, only RAID 0,1 o 5
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
looks like you have reached it's maximum performance.
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lnriveraAuthor Commented:
Are you sure that 5 MB/s is the maximum speed of RAID5 using SATA disk?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
turn OFF jumbo frames, and retest
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