I had a 2.7TB pool for 38 hosts, actual size after deduplication and 
compression.

I just upgraded to 4.0.1 and did a V3 to V4 pool migration.

The storage penalty was pretty small, about 2% or 52GB.

The inode overhead was substantial, just over a factor of 2.  In my case it was
25348763 inodes (around 11% of the ext4 default) to 51809068 (around 22% of the
default).

If you are upgrading you might want to ensure that your V3 inode usage is less
than 50% of what the filesystem is capable of.

The above migration tool 52 hours or so on a RAID 5 of 4 disks on a server
that's a few years old.

To watch I graphed it over time:
  http://broadley.org/bill/backuppc.png



------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
BackupPC-devel mailing list
BackupPC-devel@lists.sourceforge.net
List:    https://lists.sourceforge.net/lists/listinfo/backuppc-devel
Wiki:    http://backuppc.wiki.sourceforge.net
Project: http://backuppc.sourceforge.net/

Reply via email to