On Sat, Mar 30, 2013 at 8:58 AM, Stefano Mori stefano.m...@zen.co.uk wrote:
On 30 Mar 2013, at 00:25, LuKreme krem...@kreme.com wrote:
Thin != delete. Thinning is removing the entries from the database, as I
recall.
In this case, thin does equal delete.
For example:
Mar 30 13:20:50 shindig com.apple.backupd[54602]: Starting post-backup
thinning
Mar 30 13:23:01 shindig com.apple.backupd[54602]: Deleted /Volumes/Backup of
shindig/Backups.backupdb/shindig/2013-02-28-002627 (156.7 MB)
Mar 30 13:23:39 shindig com.apple.backupd[54602]: Deleted /Volumes/Backup of
shindig/Backups.backupdb/shindig/2013-03-28-233100 (68.5 MB)
Mar 30 13:24:11 shindig com.apple.backupd[54602]: Deleted /Volumes/Backup of
shindig/Backups.backupdb/shindig/2013-03-28-223255 (64.1 MB)
Mar 30 13:24:56 shindig com.apple.backupd[54602]: Deleted /Volumes/Backup of
shindig/Backups.backupdb/shindig/2013-03-28-221436 (69.4 MB)
Mar 30 13:25:36 shindig com.apple.backupd[54602]: Deleted /Volumes/Backup of
shindig/Backups.backupdb/shindig/2013-03-28-204147 (29 MB)
Mar 30 13:25:36 shindig com.apple.backupd[54602]: Post-back up thinning
complete: 5 expired backups removed
Mar 30 13:25:44 shindig com.apple.backupd[54602]: Backup completed
successfully.
Further, TimeMachine does need to delete the actual files to free up
more space. My guess is that it's quick because many of the items to
delete will be hard linked directories, which should dramatically
bring down the number of files to delete. rsync can only hard link
files, so there's going to be much more to remove.
Reason I ask is I do backups with rsync's --link-dest option, which I like,
but there's the problem of deleting the oldest timestamps, as it takes a
while...
Any way to bend the laws of physics?
My email backup (from offlineimap) contains several tens of thousands
of files and really slowed down TimeMachine (every backup had to check
every file to determine which were new in the directory). So I
switched to rsnapshot, which handled the many files much faster, but
still wasn't exactly speedy. Now I just rsync directly to the backup
location (running on FreeNAS) and rely on ZFS snapshots to quickly
make and prune old backups.
Apple really should have just executed on their ZFS project.
--
arno s hautala/-| a...@alum.wpi.edu
pgp b2c9d448
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