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Best way to expand a raw mapped drive in Vmware ESXi 6

Posted on 2016-07-25
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Last Modified: 2016-07-28
I have two disk that I need to increase the size for which are setup as raw mapped luns.
Not sure of the exact steps to get this accomplished. I know I have to increase the size of these on the san first, but then not sure what to do as far as increasing the space on the VMware side once the san side is increased.
If anyone could let me know the best way to get this done?
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Question by:vmich
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Richardson Porto earned 2000 total points
ID: 41727756
Your RDM is in virtual or physical mode ? Anyway, the following KB article describe the steps needed in both cases: https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1007021

If you have any additional doubt, just let us know.
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by:vmich
ID: 41727764
They are virtual..
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Author Comment

by:vmich
ID: 41727819
Ok I guess I don't understand the correct way to increase the raw disk size..
I increased the space on the san but know I am not sure how to increase the data store raw size.
Does this all involve an outage or can I do this on the fly?
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Author Comment

by:vmich
ID: 41727828
I also forgot to mention that right now the data store that the raw disk is residing on, has 550GB free.
So I guess I can increase the raw disk by 200GB from this free space once I know how to do that?
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Expert Comment

by:Richardson Porto
ID: 41727872
From the KB:

Virtual compatibility mode

To safely expand the RDM:
1. Expand the RDM LUN from the SAN side. Contact your vendor for assistance.
2. Perform rescan on the ESX and verify the new LUN size is observed.
3. Recreate the RDM mapping to update the mapped disk size using one of these methods:
   a) Utilize Storage vMotion to migrate the Virtual RDM disk's pointer file (vSphere 4.0 and later).
   b) Remove the RDM file from the Virtual Machine and delete from disk.
   c) Power off the virtual machine, note the scsiX:Y position of the RDM in VM Settings. Navigate to VM Settings > Add > Hard Disk > RDM, select the scsiX:Y position that the RDM was using before and then power on the virtual machine.
4. Perform a re-scan from the guest operating system. Consult your vendor for assistance.

So, since you already increased the space on SAN, now you need rescan your ESXi HBA, recreate the RDM mapping and then rescan the disks inside the VM.
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Author Closing Comment

by:vmich
ID: 41733490
good doc for steps needed.
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