topic Extending LV through SAM in Operating System - HP-UX

Extending LV through SAM

Mauro Livi — Fri, 06 Aug 2010 17:50:20 GMT

Hi all,
We have HPUX 11.11 and have room on the disks of our EVA 4400 to extend some LVs. I have OnlineJFS and would like to do this through SAM. Here are my questions:
- Can I safely do this through SAM?
- Will SAM do the lvextend as well as the fsadm portions of the tasks?
- Will unmounting or re-booting be required?

Thanks in advance.
Mauro

Re: Extending LV through SAM

Suraj K Sankari — Fri, 06 Aug 2010 18:05:26 GMT

Hi,

>>Can I safely do this through SAM?
Yes.
>>Will SAM do the lvextend as well as the fsadm portions of the tasks?
Yes.
>>Will unmounting or re-booting be required?
No.

Suraj

Re: Extending LV through SAM

Mauro Livi — Fri, 06 Aug 2010 18:54:18 GMT

Thanks Suraj,
Kind of thought so, just wondered if there were any gotchas.

Re: Extending LV through SAM

Dave Johnson_1 — Fri, 06 Aug 2010 20:29:32 GMT

FYI: I had a problem couple of years ago with trying to extend a filesystem with SAM and OnLineJFS installed, but SAM said it could not unmount the FS so it refused to do it. Turned out to be a bug in the OnLineJFS install did not set some config param in SAM correctly. One time I ran into this, HP gave me a couple of commands to run to fix it. Later there was a patch to SAM to fix it. I could not find my notes so you will have to open a case with HP if you hit that wall.
My 2 cents,
-Dave

Re: Extending LV through SAM

Tim Nelson — Fri, 06 Aug 2010 20:34:44 GMT

my 2 cents,

don't count on SAM, for anything, always seems to have something broken...

lvextend -L XXXX /dev/vgname/lvolname
fsadm -b XXXXm /mountpoint
(XXXX is a number in MB)

if you need to add another lun to the vg then add do that first then extend the lvol.
pvcreate /dev/rdsk/cxtxdx
vgextend /dev/vganem /dev/dsk/cxtdxdx

Re: Extending LV through SAM

Mauro Livi — Fri, 06 Aug 2010 20:37:24 GMT

Thanks Dave & Tim...all valuable input.

In fact Tim, you caused me to re-think that perhaps just to be on the safe side, I may want to do it manually.

Thanks
Mauro

Re: Extending LV through SAM

Torsten. — Sun, 08 Aug 2010 04:35:29 GMT

Since you run 11.11 don't extend vdisks on EVA.

You need to create new vdisks and add them to your existing VGs.

This is an easy task and even SAM can do it.

But it's no problem to do it manually - just pvcreate the new LUN, vgextend, lvextend and finally extend the file system.

Check if you use striping before you begin, maybe you need to add more than 1 LUN.

Re: Extending LV through SAM

madhuchakkaravarthy — Sun, 08 Aug 2010 14:13:07 GMT

hi

always go in command line

regards

MC

Re: Extending LV through SAM

Mauro Livi — Mon, 09 Aug 2010 14:38:05 GMT

Interesting comment Torsten. Out of curiosity, is there a specific reason for not extending an LVOL on an EVA???

Thanks
Mauro