rsync question. destination larger than source

dimitrio · 11-14-2013, 09:35 AM

Hi All

I'm using RHEL 5
I have a 50Gb logical volume (LVM) with 14Gb data on it.

I am moving this to another LV on a separate volume group.
The source and destination disks are the same size (50Gb)

I've tried rsync with -arv and with -arvl, -arvH, -arvS

No matter what the destination drive fills up. All 50Gb before the rsync completes. It only has 14Gb data.

What gives?

File system is ext3 on both.

Habitual · 11-14-2013, 09:49 AM

try the --delete option of rsync.
Example:

Code:

rsync -avz  /path/to/source /path/to/destination --delete

Edit: it could take awhile to run this as it will have to 'delete' files on the destination that do not exist any more in the source.

dimitrio · 11-14-2013, 10:02 AM

So previously deleted files are still there on the source filesystem?

dimitrio · 11-14-2013, 10:09 AM

Nope. Still the same result.

Habitual · 11-14-2013, 10:47 AM

show us the actual command you are using please.

Beryllos · 11-14-2013, 10:15 PM

You might have a lot of hardlinked files in the source filesystem. You could try the following rsync option:

Quote:

-H, --hard-links

This tells rsync to look for hard-linked files in the source and link together the corresponding files on the destination. Without this option, hard-linked files in the source are treated as though they were separate files.

Read man rsync because there are many possible complications, depending on how things are linked in either the source or destination filesystem.

Edit: Oh, wait a second...
You already tried -arvH. That should transfer hardlinks...
Nevermind!

voleg · 11-18-2013, 03:49 AM

rsync not required to move LV.
You can use LVM utilities for that.

Add physical volume to VG (man pvcreate, vgextend),
then pvmove (man pvmove) LV to new physical location.
Then umount it (LV) and close it (lvchange -a n); then use vgsplit (read man).
Activate new VG (probably not required) and mount /dev/newvg/LV where it was.

dimitrio · 11-18-2013, 04:17 AM

awesome. cheers voleg!