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Replicated datastore with existing signature

Posted on 2016-08-27
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Last Modified: 2016-08-28
I am trying to mount a replicated datastore to my DR's Esxi cluster and unable to mount on all Esxi hosts.
This is a replicated LUN. It gave me an option whether I want existing signature or new signature.
I selected the existing signature so it mounted on the esxi host instead of on all Esxi hosts.
I need to mount this data store on all Esxi hosts in the cluster.
What is the best way to mount this data store on all Esxi hosts?
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Question by:sara2000
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by:Andrew Hancock (VMware vExpert / EE MVE)
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Are you using this Replicated LUN and Source LUN at the same time. - if so it would have been better to select Re-Signature the LUN.

If you re-scan on the other hosts, does it not mount, but appear in the list of LUNs ?

can you access the SSH remotely or console, we can mount from the console/SSH.
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by:sara2000
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When I select re-signature, It creates datastore with snap*.* prefix , but the vm is unable to access to the vmdk file when i power on.
LUN appears in the LUN list on all Esxi hosts. If I try to add the it come up with only format option .
The LUN replicated to DR site.
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by:Andrew Hancock (VMware vExpert / EE MVE)
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yes, the snap prefix, is to highlight, it's possible a snapshot of a LUN!

okay, can you access console or remote via SSH ?
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by:sara2000
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Yes, I can access via ssh.
I have similar issue as on below link.
https://www.experts-exchange.com/questions/27032673/VMware-wants-to-format-an-existing-VMFS.html
My worries is that ,is it going to format the datastore if I mount it via the cli?
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Andrew Hancock (VMware vExpert / EE MVE) earned 500 total points
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It's not an issue it's by design when you have replicated or snapshot LUNs, it does not mount them because it knows the SIGnature already exists, it's been seen before, does it does not mount for protection. So gives you a choice....resig or not re-sig.

My worries is that ,is it going to format the datastore if I mount it via the cli?

rubbish.

type

esxcfg-volume -l

Open in new window


this will return. something like...

~ # esxcfg-volume -l
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 to MOUNT the volume, without destroying or re-sig.

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

Open in new window


or

esxcfg-volume -m nas3-vmfs

Open in new window


or you can use -M for permanent mount.
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by:sara2000
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Thank you Andrew , I will try this.
How do i identify the LUN which I want to mount among few LUN listing?
That is ,when I issue the command below, it is going to list several LUNs?
esxcfg-volume -l
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by:Andrew Hancock (VMware vExpert / EE MVE)
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if you use the command, it will show the datastore name!

and it only shows the LUNs not currently mounted.
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by:sara2000
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Thank you for your help Andrew. Followed your steps as above  and resolved  !!
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by:Andrew Hancock (VMware vExpert / EE MVE)
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no problems.
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