Re: Hardware Raid Expansion and LVM

On Thursday 09 October 2008 01:17:31 pm Seann Clark wrote:
All,

I am looking for a little help on finding out the best way to do
this. I had a 4 disk 1.4TB RAID 5 array, and extended that to an 8 disk
3.18TB array, on a 64 bit system.The Raid card handled the migration of
the disks well, and everything on that side is up and running as it
should. Problem is I don't know how to extend LVM to a larger size,
without doing the whole adding of physical drives, and so forth, and the
pv display doesn't show more than the 1.4TB that I started with. Most
documentation details software RAID procedures that don't really work
with this. I figure I am doing something(lots of things) wrong.

Commands I have used:

Thu Oct 09-13:10:36-root@haruhi:~> pvs -o +dev_size
PV VG Fmt Attr PSize PFree DevSize
/dev/sda2 VolGroup00 lvm2 a- 9.78G 64.00M 9.81G
/dev/sdb1 VolGroup00 lvm2 a- 1.35T 576.00M 1.35T

This error is after I resized the pv back to its original size:
Thu Oct 09-13:11:32-root@haruhi:~> lvresize -d -L 3.18T
/dev/VolGroup00/LogVol00
Rounding up size to full physical extent 3.18 TB
Extending logical volume LogVol00 to 3.18 TB
Insufficient free space: 59572 extents needed, but only 20 available

first you need to fix up the physical disk either resize the partition
/dev/sdb1 to use all of the disk. or just create a new partition using the
new disk. probably safer to just make a new partition in the free space


then make it a physical volume

pvcreate /dev/sdb2

then extend the Volume Group

vgextend VolGroup00 /dev/sdb2

then you will be able to resize the Logical Volume
lvextend -L 3.18T LogVol00

it looks like you have everyting in one VolumeGroup and a single logical
volume?


Dennis


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