Identify SAN disks not in use

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Operating Systems Linux Red Hat Identify SAN disks not in use
# 1  
Old 05-25-2011
Identify SAN disks not in use


How can I identify SAN disks not in use by the OS?

Thank you.
# 2  
Old 05-31-2011

Are you using any volume manager in the OS end.
# 3  
Old 05-31-2011
Well, we're managing around 1200 servers with a variety of unix-like OS (rhel, suse, centos, ibm aix, sunos and hp-ux).

And there are some with LVM, some with VxVM and some with none (fs's mounted directly to fdisk /dev/sdX partitions).

There is also multipathing with some systems.

To not make it more difficult, I'm trying to resolve it first in the RHEL case (LVM, VxVM and none).

Last edited by asanchez; 05-31-2011 at 11:07 AM..
# 4  
Old 05-31-2011
If the OS is not using a SAN disk then generally it will not have any knowledge of such a disk.

The OS can tell you what disks it is using, what disks are on the hardware it is running on, etc.
# 5  
Old 05-31-2011
The OS can tell you what disks it is using, what disks are on the hardware it is running on, etc.
So in RHEL, how do I know whether a SAN disk is or is not being used by the OS?
# 6  
Old 05-31-2011
try looking in the /etc/fstab

If it is not there, then run the command:

If the disk is not referenced in either place, it is not mounted, and likely not being used.
# 7  
Old 05-31-2011
As I mentioned in your other thread (this is kind of a dup btw)... using lsof is probably what you want.
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