On Sat, Aug 01, 2015 at 04:26:25PM -0600, Chris Murphy wrote: > On Sat, Aug 1, 2015 at 3:45 PM, Duncan <1i5t5.dun...@cox.net> wrote: > > Does fi usage deal with raid5 yet? > > Now that you mention it, I think it doesn't. But if it did, it would > show this problem better than df I think. > > > But, somewhere along the line he got 6 GiB of raid1 metadata. Either he > > added/rewrote a *BUNCH* of files after adding at least one device before > > the conversion that he didn't tell us about, or the conversion screwed > > up, because that's a lot of raid1 metadata coming out of nowhere! > > Yeah it's a little confusing, that's why I asked about the kernel version.
It's 6 GiB of metadata for 5.7 GIB of data, or thereabouts. 0.1% is about the expected size. Now, given the original description, it's not clear at all why the data has suddenly doubled in size -- unless there's some snapshots, and the OP did a defrag as well. > > But I'm *strongly* suspecting a pre-full-raid56-support kernel, because > > btrfs-progs is certainly reasonably new (v4.1.1, as of yesterday 4.1.2 is > > the newest as I mention above), but the fi df doesn't report global > > reserve. The only way I know of that it wouldn't report that with a new > > userspace is if the kernelspace is too old. > > Yes and that also puts it in the realm of kernels that weren't > releasing/deallocating empty chunks; although I don't know if that's a > factor, if dconvert forcibly deals with this.. It does -- you only have to look at the btrfs fi df output to see that there's no empty block groups (to within 0.1% or so) > > Finally, that's btrfs-progs 4.1.1, the one that's blacklisted due to a > > buggy mkfs.btrfs. If he created the filesystem with that mkfs.btrfs... > > maybe that explains the funky results, as well. > > Good catch. That really ought to be filed as a bug with that distro to > flat out remove 4.1.1 from the repos. If they picked up 4.1.1 fast enough, they should pick up 4.1.2 just as quickly... Hugo. -- Hugo Mills | "What are we going to do tonight?" hugo@... carfax.org.uk | "The same thing we do every night, Pinky. Try to http://carfax.org.uk/ | take over the world!" PGP: E2AB1DE4 |
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