On Fri, Apr 06, 2012 at 06:03:16PM +1000, Tim Connors wrote:
On Thu, 5 Apr 2012, Craig Sanders wrote:
[...deduping uses lots of RAM and/or L2ARC on zfs. not worth it...]
Or use the proper software for the job. [...] backuppc with rsync already dedups,
i've tried backuppc. i didn't like it. performance was abysmal, and the backup was inaccessible via normal filesystem tools. which, to me, defeats the purpose of online disk-based backups. see prev. thread on this list (with misspelt "backkuppc" in subject, with two "k"s or something like that because i mistyped it). also, IMO, zfs + rsync + snapshots do a MUCH better job. or 'zfs send | zfs receive' when backing up a zfs mount. IMO, backupppc's hard-link farm and the loss of normal filesystem level access is a far worse price to pay for de-duping than lots of RAM...so is even less worthwhile than doing it on ZFS. disks are huge and cheap these days. the problem that backuppc's deduping feature was written to circumvent is not actually a problem any more. craig -- craig sanders <cas@taz.net.au>