I need to figure out which LUNs are no longer needed (so that I can delete them of course) because they are no longer used to back RDMs. In order to do that, I need to create a map, that shows
rdm ---> LUN
for each of the active RDMs that are in use. I know how to find the RDMs that are defined- simple. But how do I figure out which LUN each RDM points to?
I've found this blog post:
http://www.gamescheat.ca/2010/08/creating-rdm-to-lun-san-mapping-on-vmware-esx-4-vcenter/
And this KB:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=100256...
The KB describes using vmkfstools -q against the rdm vmdk name, to find the LUN that an RDM maps to:
# vmkfstools -q /vmfs/volumes/46fcea8f-77873c31-e474-001aa01e7ce5/solaris10/solaris10.vmdk
Disk /vmfs/volumes/46fcea8f-77873c31-e474-001aa01e7ce5/solaris10/solaris10.vmdk is a Passthrough Raw Device Mapping
Disk Id: vml.02000000060050768019002077000000000000005323134352020
Maps to: vmhba1:0:0:0
This output clearly shows solaris10.vmdk is mapped to LUN vmhba1:0:0:0.
But when I do this command, I only get:
[root@esx01 OESCluster]# vmkfstools -q RP-GWPO1.vmdk
Disk RP-GWPO1.vmdk is a Passthrough Raw Device Mapping
Maps to: vml.0200110000600508b400089f080000700000610000485356333030
What else do I need to do, to get the LUN ID that backs a particular RDM?
