On Tue, Apr 02, 2013 at 12:12:10PM +0100, Jonathan Dowland wrote: > On Mon, Apr 01, 2013 at 05:25:48PM +0200, Steven Post wrote: > > But what if the system is powered down during a scrub? Will it continue > > when it boots up again? > > All assuming the scrub is started with 'btrfs scrub start -B <path>'. > > Why not start a scrub on reboot via @reboot in cron, too. Or would you > prefer it if you didn't always scrub upon boot?
On my newly built system, a btrfs scrub across two disks (data and metadata both RAID1) runs at about 10GB per minute. That's GB of data/metadata in-use, not disk capacity. Still, when you have a 2TB filesystem that's mostly full, a scrub will take more than three hours. You can't stop people shutting down their systems, but you can pause a scrub. btrfs scrub cancel DEVICE in the shutdown script, and btrfs scrub resume DEVICE in the startup script will pick it up from where it left off. Or, you could solve this with a social cue: "please don't turn off desktops on weekends. We run maintenance then." -dsr- -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20130402113057.gu27...@randomstring.org
