topic Re: Return LUNS to Storage in Operating System - HP-UX

Return LUNS to Storage

brian_31 — Thu, 25 Jan 2007 12:20:42 GMT

I have 5 disks (from vgdisplay -v ) which i have removed. i need to return this to the storage for reclaiming. i just have the /dev/rdsk/c#t#d#. is this info enough for re-claiming? Please advice

Thanks

brian

Re: Return LUNS to Storage

Sandman! — Thu, 25 Jan 2007 13:18:14 GMT

Better answered if you tell what kind of storage array you have? For ex. on the XP's the xpinfo(1M) utility correlates a device special file to its CU:LDEV number which uniquely identifies a LUN on the array.

Re: Return LUNS to Storage

Denver Osborn — Thu, 25 Jan 2007 13:21:55 GMT

The c#t#d# may not be enough for the SAN guys to know which luns to reclaim. The more info you can provide, the less chance of remove the wrong devices from the host.

What type of storage is it? can you also post lssf /dev/rdsk/c#t#d# output.

-denver

Re: Return LUNS to Storage

Steven E. Protter — Thu, 25 Jan 2007 13:22:49 GMT

Shalom,

pvdisplay every disk to see what volume group it is in.

vgdisplay -v all relavent volume groups to find the logical volumes.

bdf to get a list of mounted filesystems.

lvremove all logical volumes in relavent volume groups.

vgreduce the volume groups until their are no disks in them.

vgexport the volume groups.

Now you will be certain that disk can be relcaimed.

You may be able to get away with merely vgexporting all the volume groups, but I'd prefer being more thorough.

SEP

Re: Return LUNS to Storage

David P. Waters — Thu, 25 Jan 2007 13:38:01 GMT

If it is EMC storage, trying using a 'sympd list' and record the device ids under "sym".

Re: Return LUNS to Storage

brian_31 — Thu, 25 Jan 2007 13:39:51 GMT

these are HITACHI disks

Re: Return LUNS to Storage

Sandman! — Thu, 25 Jan 2007 15:45:20 GMT

Ask your SAN team if they have a host-based utility for looking at Hitachi LUN information (correlate the /dev/rdsk/c#t#d# to a Hitachi LDEV) or ask Hitachi if you have a support contract with them. Otherwise the device files won't give you much information. What tool or utility did you use when you carved out the lvols from the Hitachi LUNs presented to you?