On Sun, Mar 23, 2014 at 09:20:00AM -0700, Marc MERLIN wrote: > Both > legolas:/mnt/btrfs_pool2# btrfs balance start -v -dusage=5 /mnt/btrfs_pool2 > legolas:/mnt/btrfs_pool2# btrfs balance start -v -dusage=0 /mnt/btrfs_pool2 > failed unfortunately. > > On Sun, Mar 23, 2014 at 12:26:32PM +0000, Duncan wrote: > > When it rains, it pours. What you're missing is that this is now the > > third thread in three days with exactly the same out-of-space-when-there- > > appears-to-be-plenty problem, which is well explained and a solution > > presented, along with further discussion, on those threads. > > > > Evidently you haven't read the others, but rather than rewrite a similar > > reply here with exactly the same explanation and fix, I'll just refer you > > to them. > > Thanks. Indeed, while I spent most of yesterday dealing with 3 btrfs > filesystems, the one here that was hanging my laptop, the raid5 one that > was hanging repeatedly during balance, and then my main server were one > FS is so slow that it takes 8H to do an reflink copy or delete a backup > with 1 million inodes, I got behind on reading the list :) > > Thanks for the pointers > > > btrfs balance start -dusage=5 `pwd` > > > > Tweak the N in usage=N as needed. > > I had actually tried this, but it failed too: > legolas:/mnt/btrfs_pool2# btrfs balance start -v -dusage=5 /mnt/btrfs_pool2 > Dumping filters: flags 0x1, state 0x0, force is off > DATA (flags 0x2): balancing, usage=5 > ERROR: error during balancing '/mnt/btrfs_pool2' - No space left on device > > But I now just found > https://btrfs.wiki.kernel.org/index.php/Balance_Filters > and tried -dusage=0 > > On Sun, Mar 23, 2014 at 11:47:12AM +0000, Hugo Mills wrote: > > I think you probably shouldn't be doing a full balance, but a > > filtered one: > > > > # btrfs balance start -dusage=5 /mnt/btrfs_pool > > > > which should only try to clean up chunks which have little usage (so > > it's much faster to run). > > Thanks for the other answer Hugo. > > So, now I'm down to > legolas:/mnt/btrfs_pool2# btrfs balance start -v -dusage=0 /mnt/btrfs_pool2 > Dumping filters: flags 0x1, state 0x0, force is off > DATA (flags 0x2): balancing, usage=0 > ERROR: error during balancing '/mnt/btrfs_pool2' - No space left on device > > Looks like there is no good way out of this, so I'll start deleting > snapshots.
Before you do this, can you take a btrfs-image of your metadata, and add a report to bugzilla.kernel.org? You're not the only person who's had this problem recently, and I suspect there's something still lurking in there that needs attention. > Hopefully this will be handled better in later code. With the info you can provide from a btrfs-image... let's hope so. :) Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- Anyone using a computer to generate random numbers is, of --- course, in a state of sin.
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