On Tuesday 02 March 2010 03:29:05 Robert Collins wrote: > As I say, I realise this is queued to get addressed anyway, but it seems > like a realistic thing for people to do (use BackupPC on btrfs) - even > if something better still can be written to replace the BackupPC store > in the future. I will note though, that simple snapshots won't achieve > the deduplication level that BackupPC does, because the fils don't start > out as the same: they are identified as being identical post-backup. Isn't the main idea behind deduplication to merge identical parts of files together using cow? This way you could have many very similar images of virtual machines, run the deduplication process and reduce massively the space used while maintaining the differences between images. If memory serves me right, the plan is to do it in userland on a post-fact filesystem, not when the data is being saved. If such a daemon or program was available you would run it on the system after rsyncing the workstations. Though the question remains which system would reduce space usage more in your use case. From my experience, hardlinks take less space on disk, I don't know whatever it could be possible to optimise btrfs cow system for files that are exactly the same. > > Cheers, > Rob > -- Hubert Kario QBS - Quality Business Software 02-656 Warszawa, ul. Ksawerów 30/85 tel. +48 (22) 646-61-51, 646-74-24 www.qbs.com.pl System Zarządzania Jakością zgodny z normą ISO 9001:2000 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
