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Re: [linux-lvm] How to resize a PV located on a SAN LUN



Thomas Hager wrote:
On Fri, 2007-04-20 at 13:47 +0200, Micha Holzmann wrote:
Hello,
hi,

Now i had to increase the size of partition of sda12 which is a LVM.
why would you want to do that? if your vg is running out of free
extents, why not just add a new LUN from the SAN and extend the vg with
it?

Maybe, because their SAN configuration get bloated with smaller LUNs? When SAN enables extending size, why not use it?

I am not sure which is the right way. Within the storage managment
software i can increase the size of the LUN. After rebooting the machine
the additional space is appended at the end of partitions and it is
marked as free. How can i now increase the LVM partition. Which
tool/programm i do need for this task?
you can't really increase the physical volume, because there's a swap
partition between your physical volume and the free space.
use fdisk to partition the free space as /dev/sda14, create a physical
volume on the new partition (pvcreate /dev/sda14) and extend the
volume group with the new physical volume (vgextend yourvg /dev/sda14).

As it's swap partition, he can recreate it. So create new swap partition /dev/sda14 at the end of extended disk. Then mkswap /dev/sda14, swapon /dev/sda14, swapoff /dev/sda13. Delete /dev/sda13, add size to /dev/sda12 using fdisk. Then use pvresize /dev/sda12 (it'll autodetect new size). And after this, you can see free PE in vg.

Or better, if you can disable swap partition for some time, switch it off, delete sda13, resize sda12, pvresize sda12 and create new LV for swap inside VG. With this, next time you add some space, you won't move/delete swap partition, just resize(fdisk) and pvresize sda12.

hth,
tom.

Hope this helps,
PeS


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