LVM woes

[ositstomc]

Hi

I have a PC with two hard disks (SATA), they were both configured similarly using FC5 and the standard LVM config. One disk has just replaced the other but I would like to still access the old disk as a secondary disk, both disks are now connected and are addressed as SDA & SDB.

The problem: How can I mount the volume group on the second disk, both disks contain a Volume called 'VolGroup00'. I assume I need to rename one of these volumes in order to mount it, but how do I rename a volume which contains the / partition which is active?

There must be an easy way to this, tell me I'm stupid :-)

TomC

[daverj]

you can make the second disk part of VolGroup00. To do that you need to do 3 things:
1) destroy the partition table on it

dd if=/dev/zero of=/dev/sdb bs=512 count=1

2) initialize it as an available physical volume

pvcreate /dev/sdb

3) add the disk to the volume group

vgextend VolGroup00 /dev/sdb

that should do it. google lvm for more info and details.

davidj

edit: mind you, this will destroy all the current info on /dev/sdb. If you want to preserve it, you need to back it up. Then you can follow the steps above and then restore.

[ositstomc]

I was hoping to keep some of the data on the old disk?

TomC

[Seve]

Originally Posted by ositstomc

I was hoping to keep some of the data on the old disk?

TomC

Hello:
If I read your post correctly ? You have two volumes named the same?
You will have to rename at least one.
Just be careful and you should be fine.

If so, have a look at this thread, it should help you.
http://forum.fedoraforum.org/forum/s...ght=VolGroup00

Seve

[ositstomc]

Thanks Seve

I booted from the CD using the rescue option and was able to rename my old partition. I can now see the new name when I 'lvm vgscan' but how can I mount this volume?

TomC

[ositstomc]

FYI

There is no /dev entry for the new volume name?

TomC

[Seve]

Originally Posted by ositstomc

Thanks Seve

I booted from the CD using the rescue option and was able to rename my old partition. I can now see the new name when I 'lvm vgscan' but how can I mount this volume?

TomC

Hello Tom:
You need to mount your new volume the same way as any other partition
First, make a mount point :
for example:
mkdir /mnt/newvol
then add the following to your :
/etc/fstab
/dev/nameofnewvol/LogVolXXX /mnt/newvol ext3 defaults 0 0

Where nameofnewvol/LogVolXXX is the name of the volume group that you renamed. [if that makes sense ]

Save, exit and reboot and the new volume should be mounted at /mnt/newvol

Seve