Copy lv

[Marcelo De Florio]

How I can copy one logical volume ?

Thanks.

[Dan Hetzel]

Hi Marcelo,

Not sure to fully understand your question, but if you want an exact copy of a logical volume, you could turn mirroring on with:
'lvextend -m1 lv_path', providing you have enough unassigned disk space in the same volume group. If not, you may add a physical volume to your volume group with SAM or 'vgextend'.

Dan

[Marcelo De Florio_1]

Ok, but I need a copy in another volume group.

[Bill Hassell]

Copying using mirroring works very well with live data as the copy is constantly synchronized with the source.

If you just want to copy all the files, ownerships and permissions to another volume, use this:

cd /source_location
find . -xdev | cpio -pudlmv /new_location

The -v option in cpio will show all the files/directories as they are copied but on a slow terminal, this can slow the process down.

[Dan Hetzel]

Hi,

Bill is right, like usual ;-)
I wouldn't use the 'l' flag for cpio as this one would link files rather than copying.

Should read '...cpio -pdvum ...' instead.

Best regards,

Dan

[Henry Weldon]

In addition, if you have a large LV to copy try one of the following. If you are migrating several hundreds of GB's or TB's of data. An extended outage using a native backup/restore may be much more efficinet.

Transfer speed was 84 GB/Hour using TAR
cd /home/npd
time tar cf - . | (cd /home/npd.new; tar xf - )

Transfer speed was 21GB/Hour using FBACKUP & FRECOVER
cd /home/npd
time fbackup -f - -i . | (cd /home/npd.new; frecover -Xrf -)

The dash after the f flag specifies standard input and output.