topic Re: lvm in Operating System - HP-UX

lvm

subhashni — Wed, 08 May 2002 16:11:14 GMT

Hi,
Is there any way to increase root volume size?
Please help
Thanks

Re: lvm

Pete Randall — Wed, 08 May 2002 16:20:14 GMT

That depends on whether you mean vg00 or the / filesystem. vg00 can be enlarged but if you need to increase /, you're going to have to reinstall.

Pete

Re: lvm

Jon Mattatall — Wed, 08 May 2002 16:24:37 GMT

This link -
http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x377dabe92dabd5118ff10090279cd0f9,00.html
covers the whole thing.

In essence, you can use Ignite, online JFS, or just look for files growing unexpectedly.

Why do you want to increase it? Normally, the value at install should be sufficient....

Jon

Re: lvm

Helen French — Wed, 08 May 2002 16:29:49 GMT

Hi Subhashini:

The proper method will be to create a recovery tape and reinstall the OS. While re-installing you can specify the new size of the root LV.

However there are so many other proven methods and you will get a lot of ideas if you give a "search" on the threads (choose search button on this page and give 'extend root' and select 'community forums'). One of them:

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x77a8e7613948d5118fef0090279cd0f9,00.html

HTH,
Shiju

Re: lvm

John Carr_2 — Wed, 08 May 2002 16:53:11 GMT

Hi

YES as the others have said you can increase the root using several methods all instructions available in search facility.

why do you now want to increase root has it suddenly filled up if so you might wish to searh for root files or any other files which may be moved from root or simpy removed period.

cheer
John.

Re: lvm

Sandip Ghosh — Wed, 08 May 2002 16:53:49 GMT

The following procedure I have collected from this forum only, but I forgot who had posted this procedure. This is really good if you can follow it properly.

Assumptions,
01. You are not just an "HP kid" who will play with ignite like stuff.

02. You like taking some risk & saving your valuable time

Size of /dev/vg00/lvol1 is A (boot or /stand or /dev/vg00/lvol1)

Size of /dev/vg00/lvol2 is B (swap or /dev/vg00/lvol2)

You wanna increase size of lvol1 from A to A+X (where X is not more than B - "physical memory installed in your machine")

Basically we have to decrease size of swap to increase boot as they are contigous.

Now Extending /stand is an easy job which can be performed in 10-15 minutes.

Steps

01. Boot your machine in LVM maintenance mode
(hpux -lm at ISL>)

#rm /etc/mnttab
#vgchange -a y /dev/vg00
#lvrmboot -r /dev/vg00
#lvremove /dev/vg00/lvol2
#lvextend -L "A+X" /dev/vg00/lvol1
#extendfs /dev/vg00/rlvol1
#lvcreate -L "B-(X+10)" -C y -r n -n lvol2 /dev/vg00
#lvlnboot -b /dev/vg00/lvol1
#lvlnboot -r /dev/vg00/lvol3
#lvlnboot -s /dev/vg00/lvol2
#lvlnboot -d /dev/vg00/lvol2
#reboot -r

You have your /stand extended now

Otherwise you can do it through ignite.

Sandip

Re: lvm

Pete Randall — Wed, 08 May 2002 16:57:25 GMT

I stand corrected - how embarrasing!

Pete

Re: lvm

Jon Finley — Wed, 08 May 2002 22:28:09 GMT

If you use disk mirroring, and have vg00 currently mirrored, you have yet one more way of increasing the size of / (root).

This is assumming that with the extension of root (/) that all lvol's together don't exceed the size of your disk.
-----

reduce out the mirror through:
lvreduce -m 0 /dev/vg00/lvol? /dev/dsk/c?t?d?
(repeat for each lvol)

then use pvmove to move lvol's 8,7,6,5,4,3 and 2 over to the disk you just reduced out.

extend root (/)

then use pvmove to move the lvol's back to the original disk and re-mirror.

Jon