On 02/04 07:48 , Raoul Bhatia wrote:
> What's the issue with using LVM?  Unless you need to reinitialize the whole 
> fs, i.e. increase EXT4 inode count or switch to another fs, believe this is a 
> perfect example of where LVM shines.

I'd like to insert a word of caution based on experience. I don't know about
using LVM for copying data to a new disk; but I do know that using LVM
snapshots to get a quiesced pool for backup, was a poor idea in my case. It
took 12h to get a tar dump of a given BackupPC data pool when BPC was
fully stopped, but 2 days to try to backup the same data pool when it was
quiesced using an LVM snapshot. 

We decided it was better to have BPC offline for a short period (scheduled
on the weekend), but running full speed the rest of the time, rather than
degraded in performance for 4x as long.

Not fully relevant to the problem at hand, but still worth considering for
future reference.

-- 
Carl Soderstrom
Systems Administrator
Real-Time Enterprises
www.real-time.com

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