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ESXi 5.1 Path Selection Claim Rules

Posted on 2014-01-15
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Last Modified: 2014-01-16
One of my goals for 2014 is to gain a better understanding of how things really work in VMware.
 
Today's question, path selection policies and Claim Rules. Am I correct when I state the following..

A Claim rules specifics that a specific disk type should default / always be associated with a specific PSP correct?

Also, why would anyone want to specific a PSP on a disk instead of at the volume level..

Thanks Again
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Question by:compdigit44
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
ID: 39784338
The PSA (Pluggable Storage Architecture) uses claim rules to determine with multi pathing modules, to claim which storage devices to apply these rules and plugins.

So inanswer to your question:-

A Claim rules specifics that a specific disk type should default / always be associated with a specific PSP correct?
- Yes this is correct.

Also, why would anyone want to specific a PSP on a disk instead of at the volume level..

If we take an Equallogic LUN from a SAN, for example, the claim rule would identity it's an Equallogic device, and claim the rule, and apply a rule, so it can use a third party Dell plugin to handle multi-pathing for that LUN, e.g. the Dell Equallogic EqualLogic Multipathing Extension Module. (MEM) for VMware® often referred to as the MEM Kit, so custom path selection policy can be used, rather than Round Robin etc to better control Active (I/O) to both LUNs/paths at the same time.

It's quite interesting (if sad like us), if you look at the logs (/var/log/vmkernel.log), and you can see this happening, and the claim rules working in the background.
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by:compdigit44
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Thanks Hancock!!!!
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No problems.
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