How can I display the block size settings for a VMFS data store?

Posted on 2012-08-13
Last Modified: 2012-08-24
I am trying to figure out what settings were used for past VMFS data stores created by a previous admin.... Where can I see what format settings they used?
Question by:Thaidog
    LVL 30

    Accepted Solution

    VMWare KB has what you need.

    VMFS Block Sizes
    The block size on a VMFS datastore defines two things:
    •The maximum file size
    •The amount of space a file occupies
    To determine the block size used by a datastore:

    From the VI/vSphere Client:
    1.Select an ESX host that contains the datastore.
    2.Click the Configuration tab.
    3.Click Storage.
    4.Select the datastore.
    5.The block size is identified in the Details window under the Formatting subheading.

    From the ESX console:
    1.Log in to the ESX console.
    2.Run the command:

    # vmkfstools -P <path to datastore>

    The block size is in bold in this line:

    Capacity 429228294144 (409344 file blocks * 1048576), 8896118784 (8484 blocks) available

    Where 1048576 is equivalent to a 1 MB block size on a VMFS datastore.

    LVL 6

    Assisted Solution

    Hi Thaidog

    Check out LucD's awesome script in Post 6 at:

    He's the co-author of and knows his stuff!
    LVL 116

    Assisted Solution

    by:Andrew Hancock (VMware vExpert / EE MVE)
    Select Properties on the datastore using the vSphere Client.
    LVL 8

    Assisted Solution

    you can log in to the esx console and type the command

    # vmkfstools -P <path to datastore>

    or 1.

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