I pushed a tentative change to holland-backup/master earlier this week to improve purge backups on ext3. This does a gradual ftruncate() on files before doing an unlink(). This was done to address some performance issues when holland has large files (particularly large tarballs) in $backup_directory and simply unlink()ing those on ext3 causes a huge io spike and often io stalls, particularly if something like mysql, happens to be doing synchronous io on the same filesystem.
This is essentially the same issue discussed here: http://www.mysqlperformanceblog.com/2009/06/16/slow-drop-table/ Although not directly related to MySQL in this case. :) XFS significantly improves this but you can still see stalls of a few seconds (but much less dramatic than the 2+ minutes of ext3), so I think the approach is generally useful in unix environments. This change came in here: https://github.com/holland-backup/holland/commit/8010ab72525e1be02f14c4f39a1f06083fb3d425 I am throwing it out here in case anyone has any comments or concerns with this approach. ~Andy _______________________________________________ Mailing list: https://launchpad.net/~holland-coredev Post to : [email protected] Unsubscribe : https://launchpad.net/~holland-coredev More help : https://help.launchpad.net/ListHelp
