topic Re: Vmware 6.5 LUN which snapmirrored not mount on all ESXi in ONTAP Discussions

Vmware 6.5 LUN which snapmirrored not mount on all ESXi

StephaneGilliers — Wed, 04 Jun 2025 11:13:41 GMT

Hello,

I remark something strange with Vmware 6.5.

FAS are the destination of Snapmirror.

We make some tests for activate the PRA and mount the LUN to VMWARE PRA.

We make a break of SnapMirror on the volume for put the volume in writable mode.

We mount the LUN on vmware but it not visible on all ESXi (just the ESXi where we mount the LUN).

In another ESXi we see correctly the LUN in "list of LUN" with naa.600.a09..... but that's all in colum datastore instead to see the name of LUN we see "unconsumed"

I suspect something in vmware but if I create a new fresh LUN on NetApp (without SnapMirror) I have not this problem.

The LUN are mounting on all ESXi.

Thank's for your idea,

Re: Vmware 6.5 LUN which snapmirrored not mount on all ESXi

Trubida — Fri, 10 Apr 2020 14:02:57 GMT

I believe this is due to VMware detecting the LUNS as Snapshots. Follow the instructions on this KB and you should be able to resolve the issue.

https://kb.vmware.com/s/article/1011387

Re: Vmware 6.5 LUN which snapmirrored not mount on all ESXi

StephaneGilliers — Fri, 10 Apr 2020 15:14:04 GMT

Thank you for your quick reply.

I remember hearing something about the resignature of LUNs.

I follow your vmware kb and found also a KB NetApp

https://kb.netapp.com/app/answers/answer_view/a_id/1004336/~/what-causes-esx-vmfs-to-disappear%3F-

Visibly we need to pass this command for LUN mounting after the SnapMirorr's break

list orphaned VMFS datastores
esxcli storage vmfs snapshot list

Resig VMFS datastore
esxcli storage vmfs snapshot resignature --volume-uuid=

Do you know after this commands when we do a resync and reput in production snapmirror if you need again launch resignature in Production ESX ?

Thank you

Re: Vmware 6.5 LUN which snapmirrored not mount on all ESXi

Trubida — Fri, 10 Apr 2020 15:33:14 GMT

So I wouldn't resignature the LUN. I would just run the following so that you don't have to resignature when you perform a revserve resync.

# esxcli storage vmfs snapshot mount -l label|-u uuid

Re: Vmware 6.5 LUN which snapmirrored not mount on all ESXi

StephaneGilliers — Fri, 10 Apr 2020 17:00:28 GMT

Ah ok I understand.

Just the "simple mount" for can do a giveback after.

Thank you for your explanation I check that.

Re: Vmware 6.5 LUN which snapmirrored not mount on all ESXi

StephaneGilliers — Sat, 02 May 2020 15:00:21 GMT

Hello all,

Just a feedback on this problem.

Customer say me he don't choose "resign" option when he mount the datastore to vmware.

Now it's ok.

Thank you all for your quick help very helpfull !