to put together filesystems to one filesystem

[Dagmar Bendová]

I want to put together some filesystems to one filesystem. The filesystems are in different volume groupes. I use LVM. Can you advice me some elegant solution? Thanks.

[Elmar P. Kolkman]

It totally depends...

Do you need to expand the filesystem or can you just move the data?
Are the disks used for the lvol you want to destroy solely used for that lvol so you could move them to the lvol you want to expand?
Are you using mirroring?

For instance, you could temporarily use mirror disks to expand your lvol and filesystem, move the data, destroy the other lvol, move the disks to the right volumegroup, add mirroring again.

[G. Vrijhoeven]

Hi,

Are you able to stop the software running in those file systems? if so:

Create one large lvol and copy all the data to this new lvol. e.g.

# cd fromdir ; tar cvf - . |( cd todir; tar xf - )
# umount fromdir
# mv todir fromdir

Gideon

[Sunil Sharma_1]

Hi,

There is no LVM command using that you can add file system.

You have to do it manually like,
1. Create a big FS
2. MV the content of other FS to this .

Regards
Sunil

[Mister_Z]

1. Calculate the space the fs to merge occupy. i.e,:
#du -ks
provides the size in Kb for the fs mounted on

2. Create an lvol whose size it's, at least, the sum of the spaces of 1.
#lvcreate -L -n lvmerge /dev/vgXX

3. Create the target fs and its mount point:
#newfs -F vxfs /dev/vgXX/rlvmerge
#mkdir /mntlm
#mount /dev/vgXX/lvmerge /mntlm

4. Copy the contents of the source fs to the target one, ie:
#find -print | cpio -dumpxlv /mntlm
...
#find -print | cpio -dumpxlv /mntlm

Hope this helps.

[Dagmar Bendová]

Thank for your answer, but it is not answer for my question. I have 5 filesystems, 5 logical volumes at 3 volume groups. And I want put together these filesystems to one filesystem. for example
these logical volumes are mounted now:
/dev/vg02/lvol2 /cat
/dev/vg02/lvol3 /pork
/dev/vg03/lvol3 /dog
/dev/vg00/lvol11 /sheep
/dev/vg03/lvol7 /bird
I want to mount these logical volumes
to filesystm /cat_pork_dog_sheep_bird

I do not want to expand, i do not want to create new filesystem and move filesystems to new filesystem. Is it possible to put together logical volumes in differrent volume groups or create filesystems with more logical volumes or mount more logical volumes to one filesystems?
mount /dev/vg02/lvol2 /dev/vg02/lvol3 /cat_pork?
Tanks.

[Mister_Z]

I think the solution you're suggesting is not feasible. The only solution possible is by creating a larger file system that encloses the source filse systems.

Regards

[Robert-Jan Goossens]

Hi Dagmar,

Simple answer no.

You have to create one large filesystem or expand a filesystem and copy all your animal directories into the one filesystem.

Regards,
Robert-Jan