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Wednesday, March 6, 2013

iscsi conenctions in guest vs esxi host

Posted on 2:29 PM by Unknown
Dave.Mishchenko  wrote a nice post on the advantages and disadvantages of using in guest iscsi connections vs having your esxi host handle it.

http://communities.vmware.com/message/2206774



Advantages
- easy to get past the 2 TB disk limit.  This was more of an issue in the past as you can get around this in ESXi 5.1 with a physical RDM
- required for official support with MS clustering - (see the support protocols section) - http://kb.vmware.com/kb/1037959

Disadvantages
- the backend storage network is exposed to a guest OS
- portability of the VM may be hindered - i.e. you have to make sure the destination host will allow for the VM to have all the network access it needs.  That'll probably be the case, but it's more difficult to verify than if the storage is presented via ESXi.
- a snapshot of the VM also requires another snapshot of the iSCSI LUN that the guest OS accesses
- you need to configure multipathing with the guest OS



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