topic Re: lvextend on wrong disk in Operating System - HP-UX

lvextend on wrong disk

Fernando Boza — Wed, 08 Jul 2009 12:59:32 GMT

Hi
I have a VG with 4 LUNs.... 2 from storage1 and 2 from storage 2

I have 2 PVG on that VG: PVG0 and PVG1
PVG0 with 2 LUNs from storage1
PVG1 with 2 LUNs from storage2

The LVs are mirrored with PVG0 and PVG1
But, when I run lvextend for any LV... that extend mirror the LV on the same PVG

Any idea?

Re: lvextend on wrong disk

Sunny123_1 — Wed, 08 Jul 2009 13:04:07 GMT

Hi

Post your lvextend syntax for more details.

Regards
Sunny

Re: lvextend on wrong disk

Steven E. Protter — Wed, 08 Jul 2009 13:05:15 GMT

Shalom,

Because you are not specifying the PVG

lvextend -m 1 < logical volume name >

Prevents this:

lvextend -m 1 /dev/vg01/lvol7 /dev/dsk/c1t1d0

Don't let the command pick the disk you pick it.

SEP

Re: lvextend on wrong disk

Torsten. — Wed, 08 Jul 2009 13:07:39 GMT

Please give us more details:

- the contents of the lvmpvg file
- your complete command line
- a "vgdisplay -v" and "lvdisplay -v" for the items in question

Re: lvextend on wrong disk

Fernando Boza — Wed, 08 Jul 2009 13:09:56 GMT

The LV is already mirrored... I want to extend the size.

lvextend â L 10000 /dev/vgname/lvolname

Re: lvextend on wrong disk

Patrick Wallek — Wed, 08 Jul 2009 13:10:49 GMT

Your allocation policy for this LV should be set to PVG-strict.

If you do an 'lvdisplay /dev/vg?/lv?' (specifying the real LV name) and look at the "Allocation" line, you should see "PVG-strict/distributed". If you don't, you should change it.

# lvchange -s g /dev/vg?/lv?

This option disallows mirrors of the LV to share the same PVG, which is what you want. Have a look at the lvcreate or lvchange man page for information on teh PVG-strict policy.

Now when you do an lvextend, the mirror should be correctly allocated.