[SOLVED] lvm migration

geekslinux · 02-20-2015, 12:11 PM

In RHEL 6.5 I have a lvm(lv_data) which is a lun coming from IBM storage v7000 and I have another lun which is coming from EMC as lv_data_new.

lv_data mounted to /data which is currently holding the data of the app
lv_data_new mounted as /data_new

Now I want to migrate the data from this the old lun to new lun and remove the old lun. what steps need to be followed for it.

jstephens84 · 02-21-2015, 05:16 PM

I would use the following which will
recursively transfer all files from the directory lv_data into the lv_data_new directory on the local
machine. The files are transferred in "archive" mode, which ensures that symbolic links, devices, attributes, permissions, ownerships, etc.
are preserved in the transfer. Additionally, compression will be used to reduce the size of data portions of the transfer.

the above was pulled from the rsync manual but with a little editing to add your directories to it.

Code:

rsync -avz /lv_data lv_data_new

syg00 · 02-21-2015, 09:24 PM

When I first read this (before the edit), the OP indicated the data had been sync'd to /data_new already.

Shut down the application, copy the data, umount both, mount lv_data_new as /data, restart the application.

geekslinux · 02-23-2015, 12:57 AM

Thanks for the reply the above method was followed. But in some articles I read for LUN migration they used lvconvert. please find the links below

http://storagemeat.blogspot.in/2010/...linux-lvm.html
http://www.unixarena.com/2012/07/red...using-lvm.html

Can you please clarify what is the difference in method described in the links and rsync the data, unmounting and remounting. I think they can be used to do online without unmounting the application.

syg00 · 02-23-2015, 04:45 AM

Yes, mirroring is another good option. Note the comment re breaking the pair in the first link you posted.
pvmove is another option - it can be resumed from an interruption, but the source is not a valid backup once the move starts.

Depends on individual requirements which is "better".