VMFS label missing on cloned replica

During a recent DR test one of my replicated volumes was missing a VMFS label and I wasn't able to get it mounted.  After the rescan, I did the normal add storage and when I selected that volume, instead of asking to resig or keep the existing signature, it asked me to format as VMFS5 or VMFS3.  

I tried multiple snapshots and different servers and they all wanted to format.  

vSphere 5.1 attached to Equallogic connected via iSCSI.
bigjon-x64Sr. Systems EngineerAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
this is more common than you think....

have you tried logging in at the console (command line) and using the following command

esxcfg-volume -l

this will respond with

VMFS3 UUID/label: 4cc89503-f054d0d4-2865-00221958e471/nas3-vmfs
Can mount: Yes
Can resignature: No (the volume is being actively used)
Extent name: naa.600140588e9bab7d2b7ed4b53dadc1de:1     range: 0 - 1048319 (MB)

and then do...

esxcfg-volume -m 4cc89503-f054d0d4-2865-00221958e471

or

esxcfg-volume -m nas3-vmfs
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gheistCommented:
You need VAAI and make sure snapshots are offloaded to equallogic, so that the replica is accurate and usable
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bigjon-x64Sr. Systems EngineerAuthor Commented:
esxcfg-volume -l returns

VMFS UUID/label:  NA
Can Mount: No (some extents missing)
Can resignature: No (some extents missing)
Extent Name naa.6090a0b8a0550a2d7e3435ca4a25347b:1 range 857127608576 -857127608831 (MB)

I don't remember extending the volume since the last test.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
This is the reason it cannot be mounted, it does not appear to be complete or is corrupted.

Are you using the recommended Dell Equallogic Virtual Storage Manager for VMware vSphere on your Hosts and vCenter Server, which provides you with a GUI, interface to Create Smart Copies (SAN Snapshots) and Replicas, which can be mounted from within vSphere vCenter Server.
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bigjon-x64Sr. Systems EngineerAuthor Commented:
Yes and no.  The replication for this volume was set up prior to VSM and hasn't had a problem in previous D.R. tests, so it wasn't a big priority to change.  Is the best course to create a new data store, configure replication, and storage vmotion the affected VMs?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I think I would test, create a new datastore, configure replication on this new datastore and LUN, and then check and present to VMware ESXi.
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bigjon-x64Sr. Systems EngineerAuthor Commented:
Thanks for the help.
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