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vCenter storage device lost communication?

snyderkv
snyderkv asked
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Last Modified: 2020-02-26
Within vCenter storage devices, I get a list of NetApp LUNs attached with their LUN ID.

One LUN shows Lost Communication and the datastore shows inaccessible.  I looked at the LUN ID on the NetApp storage but can't find any such name or LUN ID.

Is there another way I can find the vCenter LUN/Datastore on the NetApp storage so I can remap it with the correct LUN ID?

Thanks in advance.
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Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
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Commented:
You should have a LUN mapping on your NetApp Filer which matches your host.

Any LUNs unmapped, been deleted ?

otherwise it's going to be difficult to match, do you have any LUNs currently unused on the NetApp filer ?

what was the size, does it shows a size maybe you can match by size ?

Author

Commented:
Sizes are all 15TB
There is no matching LUN ID from vSphere to NetApp. The names never match up perfectly either so I can't be sure it was deleted. There are about 40 datastores.

I may make another post regarding extents right now because this may have to do with a deleted extent. You see the datastore had two 15TB luns in it to extend the drive space. One of the extents was possibly deleted, renamed, moved or whatever. The guy is on vacation so I'm trying to get this working.

Can I unmount the datastore and remount the datastore without the other extent without losing data?
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
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Commented:
If a LUN was deleted which was part of a EXTENT in another Datastore, e.g. Datastore spanned two LUNs.


This is dangerous, because you could lose the entire datastore.

This is why if you use EXTENT across LUNs, you must ensure very well documented, so they do not get deleted.

Author

Commented:
I get that it's bad when you lose a LUN that was part of a spanned datastore but that's what happened and I'm trying to recover. The storage device says lost communication and the datastore shows inaccessible. What choices do I have? Any vmware documentation on this? Currently searching myself and getting mixed results.
VMware and Virtualization Consultant
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Commented:
I get that it's bad when you lose a LUN that was part of a spanned datastore but that's what happened and I'm trying to recover.

Restore your VMs from backup, there is no guarantee if you add the EXTENT back, it will work.

You've effectively destroyed your datastore. (cut it in half).

The storage device says lost communication and the datastore shows inaccessible. What choices do I have? Any vmware documentation on this? Currently searching myself and getting mixed results.

Disaster Recovery time, if you have half a datastore, raise an SR with VMware Support.

Losing one extent will offline the whole volume, this states not completely true, unless he head extent has been deleted!

Source
https://blogs.vmware.com/vsphere/2012/02/vmfs-extents-are-they-bad-or-simply-misunderstood.html

Author

Commented:
Oops looks like I found the netapp volume offline. Supposedly it hides the LUNs from view when their parent container is offline. Will make another post of vmdk attachment issues later which is the real problem.

Thanks again for your help.

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