VMware and iSCSI – explained

A colleague alerted me to a great post regarding iSCSI performance with specific reference to VMware ESX hosts.

I know many organisations operating VMware farms with iSCSI storage systems, and I expect many will fall foul of some of these excellent gotchas.  The most important of which is that you should really have multiple iSCSI targets if you want to maximise your performance.  Hence, make sure your iSCSI storage hardware supports presentation of LUN’s as individual targets.

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One thought on “VMware and iSCSI – explained

  1. It’s been pointed out that the above post is slightly off topic for the blog. Sorry about that, but think about it this way:
    Many cash strapped businesses may opt for iSCSI purely on a cost basis when compared to Fibre Channel. For those companies, or others about to implement, the above post gives good food for thought.
    You can get great performance from cheap iSCSI hardware if you follow the advice and use the one LUN per target rule.
    If you’ve already implemented your SAN and it only allows one target address with multiple LUN’s, then sorry, but at least you don’t have to spend hundreds of pounds on diagnosis by consultants to tell you why it doesn’t seem quick.

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