Poor transfer rate ESXi 4.0 and NAS

[AlexD1979]

Hello,

We install our IBM x336 Server with 2x3.2 XEON CPU,10 GB RAM, 2xU320 SCSI HDD and 2x Gigabit Broadcom NIC as a ESXi 4. Server. To increase the Storage, we buy an iOmega external NAS StorCenter ix2 (2x1TB RAID 1).

After the installation of ESXi we create a newe Storage //storage01/nas/vm01 and bound it to ESXi. Very easy, yes. But, the performance is very slow to transfer files with the VI Client, or directly use the "Move file" in Storage Explorer. For a 10 GB VM there are 480 Minutes (7 hours!!) calculated and it seems that he really need it to copy.

A similar problem seems to use the VM Converter. We try to convert a lot of VMs directly to the attached NAS Storage on the Server, but the process fails for every VM suddenly with an error in the copy process of the disc file. Never at the same point, like 21% or 44% or 80%. If we use the converter and point to the local Storage (the HDD) everything is fine and for a 10 GB VM he calculate 1 hour. For a NAS-based VM he calculate 4 or 6 hours.

What is the bottleneck in this case of ESXi? We can enable JumboFrame in the ix2, but would it help us?

Thanks

Alexander D.

[athlon_crazy]

How fast you can get when copy / paste files within omega itself (NAS-to-NAS)?

vcbMC-1.0.6 Beta

vcbMC-1.0.7 Lite

[AlexD1979]

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[srinivasvivek]

I would check the following..

Check if there are any faults on Iomega (if it is trying to rebuild a disk etc)

Whether my Iomega ix2 is configured as RAID 1 than JBOD

Whether the Iomega Ethernet port is set correctly and any switches in between (connect your Iomega directly to another client to see if the host can read/write fast enough on a gigabit ethernet)

[AlexD1979]

Hello,

I copy a VMWare VM with 10 GB from my PC (1GBit) to the NAS ix2 (1GBit) and reaches a transfer rate of 12MB/s (14 Minutes for 10 GB data to copy). My PC is conected through a Switch, and itself is connected with FC LWL 1 GBit to another Switch.

[athlon_crazy]

Ahh you consider lucky can get 12MB/s. Mine Intel SS4200-E last time only max 4-7MB/s (20GB transfer within 1 hour)

vcbMC-1.0.6 Beta

vcbMC-1.0.7 Lite

[JoJoGabor]

So I assume the NAS is mountes as an NFS export? How is your VMkernel vSwitch configured? WHat speed are the pNICs for this vSwitch set to? If using auto-negotiate what speed has it negotiated at? Try setting these speeds manually to 1gbps if that fails try 100/Full.

Similaraly check for your SC element for the NAS switch

[PaulSvirin]

Please have a look at the ideas suggested at

Hope they will be helpful.

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iSCSI SAN software

http://www.starwindsoftware.com