topic Re: AutoRAID rebuild/LVM in Operating System - HP-UX

AutoRAID rebuild/LVM

Don Bentz — Mon, 23 Oct 2000 20:18:49 GMT

In order to rebuild an entire 12H array (connected/used by only 1 server), I believe I need to:
1) lvremove all but 1 of the volumes in each of 2 volume groups there.
2) vgreduce specifying the last remaining logical volume.
3) vgremove the volume group.
And here's where I am not certain:
4) pvremove(?) the physical volumes to destroy the PVRA? (in order to avoid some of the other issues documented in this forum).
If these steps are accurate, I should be able to carve up LUNS, create physical volumes, volume groups, then logical volumes, and restore the data, right?

Re: AutoRAID rebuild/LVM

Andreas Voss — Mon, 23 Oct 2000 20:41:44 GMT

Hi,

i would do:
1) vgexport vgXX
2) arraycfg -d -L (for each LUN)
-------------------------
Now create new LUN's with arraycfg.
pvcreate -f
mkdir /dev/vgXX
mknod /dev/vgXX/group c 64 0xXX0000
vgcreate vgXX
lvcreate vgXX ...

Regards

Re: AutoRAID rebuild/LVM

James R. Ferguson — Mon, 23 Oct 2000 20:47:18 GMT

Don:

Give that you want to start from scratch, and you have copied your data somewhere where it can be restored, do:

1. Unmount ('umount') each filesystem associated with a logical volume in quesstion and 'lvremove' all of the logical volumes that make up the volume group.

2. Remove all but one physical volume belonging to the volume group with 'vgreduce'.

3. 'vgremove' the volume group.

4. 'pvcreate', 'vgcreate' and 'lvcreate' appropriately.

See the man pages for each command mentioned above. They contain some good examples and guidelines.

...JRF...

Re: AutoRAID rebuild/LVM

Don Bentz — Mon, 23 Oct 2000 20:49:39 GMT

Whoops. I suppose I'll also have to remove the special device files "bound" to the LUNs before I can creat the new LUNs, right? What's the best (most effective) way to do this, SAM? rmsf? or the AutoRAID control panel?

Re: AutoRAID rebuild/LVM

Andreas Voss — Tue, 24 Oct 2000 05:34:33 GMT

Hi,

after removing all lvols and vgs you could do a rmsf -H
The hardware_path can be obtained by ioscan -fnC disk
(I don't think you have to do this because when you create new LUNS you will have back the same devices)
After that remove the LUNS with:
arraycfg -L -d
OR
reformat the AutoRAID (goes quicker):
arrayfmt -F
Now your AutoRAID is completely scratched.
Start with creating new LUNS with SAM or
arraycfg -L -a

Regards