On Sat, March 20, 2010 07:31, Chris Gerhard wrote: > Up to a point. zfs send | zfs receive does make a very good back up scheme > for the home user with a moderate amount of storage. Especially when the > entire back up will fit on a single drive which I think would cover the > majority of home users.
My own fit on a single external drive; but I've noticed that I have a rather small configuration (1.2TB nominal, less than 800GB used). Most people I hear describing building home NAS setups put between 4 and 10 of the biggest drives they can buy in them -- much more capacity than mine (but then I built mine in 2006, too). I'm not clear how much of it they ever fill up :-). > Using external drives and incremental zfs streams allows for extremely > quick back ups of large amounts of data. > > It certainly does for me. > http://chrisgerhard.wordpress.com/2007/06/01/rolling-incremental-backups/ So far, for me it allows for endless failures and a LOT of reboots to free stuck IO subsystems. Your script seems to be using a simple zfs send -i; what I'm trying to do is use an incremental replication stream, a -R -I thing (from memory; hope that's right!). This should propagate (for example) my every-2-hours snapshots over onto the backup, even though I only back up to a given drive every two or three days (three backup drives, rotating one off-site). Unfortunately, though, it doesn't work; hangs during the receive eventually. I'm waiting for the 2010.$Spring stable release to see how it behave there before I get really energetic about debugging; for now I'm just forcing pool recreation and full backups each time (destroying the filesystem also hangs). Given that full backups run through to completion, whereas incrementals fail even though they're pushing a lot less data and take a lot less time, I'm not inclined to blame my USB hardware. -- David Dyer-Bennet, d...@dd-b.net; http://dd-b.net/ Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
