It's best to have a one to one ratio for vmfs to lun
Is it possible to put more than one datastore on a lun?
yes you can but we don't recommend it. the reason for not recommending this is lun locking. when we temporarily lock a volume to do metadata updates we lock the FULL LUN and not only the partition. So when you have 2 VMFS volumes on a single LUN chances are bigger you will run into conflicts. Avoid it!
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According to -amvmware
I have spoken with MS and they recomend best practise is to follow the same storage design principles for cluster aware file systems as for VMFS ie one datastore or volumer per lun.
Pasted from <http://communities.vmware.com/message/1484591>
Adding multiple datastores to ta lun doenst seem to be made easy, so that is a plus for those out there that are a little less familiar with vmfs. Its not like windows where you can make several volumes on a disk.
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