Which two statements are about Unplanned Device Loss in a vSphere 5 environment?

Which two statements are about Unplanned Device Loss in a vSphere 5 environment?
(Choose two)

A.
It is condition where an ESXi host determines a device loss has occurred that was not planned.

B.
Performing a storage rescan restores access to determine why device loss occurred.

C.
It is a condition where an ESXi host is unable to determine why device loss occurred.

D.
Performing a storage rescan removes the persistent information related to the device.

Explanation:

Page 132 from vsphere-esxi-vcenter-server-50-storage-guide.pdf

6 Comments on “Which two statements are about Unplanned Device Loss in a vSphere 5 environment?

  1. chouse says:

    A & D, possibly

    http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2004684

    Planned versus unplanned PDL

    A planned PDL occurs when you there is an intent to remove a device presented to the ESXi host. The datastore must first be unmounted, then the device detached before the storage device can be unpresented at the storage array. For more information on how to correctly unpresent a LUN in ESXi 5.x, see Unpresenting a LUN in ESXi 5.x (2004605).

    An unplanned PDL occurs when the storage device is unexpectedly unpresented from the storage array without the unmount and detach being executed on the ESXi host. To cleanup an unplanned PDL:
    All running virtual machines from the datastore must be powered off and unregistered from the affected datastore.
    From the vSphere Client, go to the Configuration tab of the ESXi host, click Storage.
    Right-click on the datastore being removed, and choose Unmount.

    A Confirm Datastore Unmount window displays. When the prerequisite criteria have been passed, the OK button appears.

    Perform a rescan on all of the ESXi hosts that had visibility to the LUN.

    Note: If there are active references to the device or pending I/O, the ESXi host still lists the device after the rescan. Check for virtual machines, templates, iso images, floppy images, and raw device mappings, which may still have an active reference to the device or datastore.

  2. Nick says:

    It seems to be that A,C and D are all true. Since the word “unplanned” is listed in the name of the condition.

    Really odd question. Someone needs to post it on vmware.com to figure out what on earth they really want from us here.

  3. TwojaStara04 says:

    Unplanned Device Loss in a vSphere 5 environment = A condition where an ESXi host determines a device loss has occurred that was not planned. Performing a storage rescan removes the persistent information related to the device.


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