> -----Original Message----- > From: Zygo Blaxell <ce3g8jdj@xxxxxxxxxxxxxxxxxxxxx> > Sent: Saturday, 2 May 2020 4:01 PM > To: Paul Jones <paul@xxxxxxxxxxxxxxx> > Cc: Phil Karn <karn@xxxxxxxx>; Jean-Denis Girard <jd.girard@xxxxxxxxx>; > linux-btrfs@xxxxxxxxxxxxxxx > Subject: Re: Extremely slow device removals > > > > > Delete seems to work like a balance. I've had a totally unbalanced > > raid 1 array and after removing a single almost full drive all the > > remaining drives are magically 50% full, down from 90% and up from > > 10%. It's a bit stressful when there is a missing disk as you can only > > delete a missing disk, not replace it. > > Huh? Replacing missing disks is what btrfs replace is _for_. Oh I see where I went wrong. I used a command like btrfs replace start missing /dev/sdf1 /mnt when I should have used btrfs replace start 999 /dev/sdf1 /mnt Yet another quirk of BTRFS...
