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ofacetx
Contributor
Contributor

iSCSI Considerations for ESX 3.5

We are thinking of using a iSCSI target (HP 2012i) for 2 of our ESX 3.5 Hosts because we are running out of Local Storage and we want to take advantage of VMotion. One of the main questions is that do we need to to have a local iSCSI target (something sitting ont he same GigE LAN as the hosts), or can it be over a WAN connection where theroetically we would get no more than 100/MB but more like 5 - 10 MB. Our applications running on the VMs do A LOT of I/O intensive read/writing because they are real-time databases so we are concerned with this WAN link.

I really don't want to use this WAN link option, but I need something in a whitepaper or offical documentation that says that iSCSI in ESX environments recommends or requires GigE conenctiviety between the host and the iSCSI target.

Thanks for you rresponses!

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3 Replies
ctfoster
Expert
Expert

You're not going to be able to run iSCSI over a WAN whatever the bandwidth. The main factor is not always bandwidth but latency and this is going to be hard to control over a WAN.

I don't think routed IP is supported for iSCSI even in a LAN environment.

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depping
Leadership
Leadership

right on, the latency will be a huge problem.

Duncan

My virtualisation blog:

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ofacetx
Contributor
Contributor

Found it: http://www.vmware.com/files/pdf/iSCSI_design_deploy.pdf

It mentions gigabit networks and LAN (not WAN).

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