vSphere Storage Appliance

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  • 1.  Data stores per LUN

    Posted Sep 15, 2011 12:24 PM


    Im just reconfiguring our SAN, and have setup one large array as a single LUN to ESXi 4.1.

    I was under the impression that i could have multiple datastores on one LUN, with each host accessing a different datastore on that LUN?

    Can somoene confirm?

    Or will i have to carve the array up SAN side, and assign a chunk for each datastore i want, on a different LUN?

    Thanks in advance all. :smileyhappy:

  • 2.  RE: Data stores per LUN
    Best Answer

    Posted Sep 15, 2011 12:29 PM

    normally it's 1 LUN = 1 Datastore, and multiple host can access the same datastore so that virtual machine can be migrate to different host (vMotion).

  • 3.  RE: Data stores per LUN

    Broadcom Employee
    Posted Sep 15, 2011 12:35 PM


    You need to do a 1:1 mapping with Datastores to LUNs

    Never create multiple datastores on a single LUN


    Please award points if this is helpful or correct :smileyhappy:

  • 4.  RE: Data stores per LUN

    Posted Sep 15, 2011 12:56 PM


    You may create multiple datastore in a single lun using command line but this option is NOT recommended, this will lead to more SCSI reservation conflicts because for every option on those datastores the ESX hosts would have to place a lock on the metadata region of the LUN. This configuration will work but not recommended for production use case.

    VCP3/4, HPCP, HP UX CSA http://kb.vmware.com/

    If you found this or other information useful, please consider awarding points for "Correct" or "Helpful".

  • 5.  RE: Data stores per LUN

    Posted Sep 16, 2011 09:56 AM

    Right, so ive split up the LUNs into 500Gb chunks, with 500Gb datastores per LUN.

    Most logical way to do it?

    Thanks for the replys everyone. :smileyhappy:

  • 6.  RE: Data stores per LUN

    Broadcom Employee
    Posted Sep 16, 2011 10:25 AM

    That is the most effortless way to do it :smileyhappy: and 500GB is conservative enough.

    There are some considerations around Datastores but the main one is

    - Number of VMs/vmdk's per datastore depending on workload

    So creating a few 500GB Datastores will be fine, but try to spread the workload across them all.

    In other words do not fill up the 1st datastore and then move to the next.

    Also try to keep your high I/O VMs on separate datastores

    I have attached a LUN size calculator just in case


    Please don't forget to award points for correct/helpful responses :smileycool:

    We are not here to help, we are her for points - Just kidding :smileyhappy:

  • 7.  RE: Data stores per LUN

    Posted May 02, 2015 04:24 PM


    Just curious did you create the LUNs calculator?

    I am new to vSphere and in what scenario have you used the LUN calculator?

  • 8.  RE: Data stores per LUN

    Posted Sep 16, 2011 04:03 PM

    Points given ;-)

    Thanks for the help guys and gals. :smileyhappy: