On Mon, Jul 09, 2012 at 10:06:24PM +0200, Jan Engelhardt wrote: > > On Monday 2012-07-09 21:25, Hugo Mills wrote: > >On Mon, Jul 09, 2012 at 09:14:03PM +0200, Jan Engelhardt wrote: > >> > >> On openSUSE_12.1 with Btrfs v0.19+20120406, the following can be > >> observed: after a change of the profiles, total=,used= is no > >> longer shown: > >> > >> 20:49 mmsrv1:~ # btrfs fi df /top.srv/ > >> Data, RAID10: total=152.00GiB, used=121.07GiB > >> System, RAID1: total=40.00MiB, used=44.00KiB > >> System: total=4.00MiB, used=0.00 > >> Metadata, RAID1: total=112.00GiB, used=1.30GiB > >> Metadata: total=8.00MiB, used=0.00 > >>[...] > >> 21:10 mmsrv1:~ # btrfs fi df /top.srv/ > >> Data, RAID10: total=156.00GiB, used=124.35GiB > >> System, RAID10: total=128.00MiB, used=48.00KiB > >> System: total=4.00MiB, used=0.00 > >> Metadata, RAID10: total=112.00GiB, used=1.38GiB > > > > What's the problem here? You no longer have any RAID1 chunks, so > >it's not showing them. > > Rather tha a 4-line output, I would have expected this 6-line output > that I would also get when mkfs'ing a new fresh btrfs volume with > raid10 from the start: > > Data, RAID10: total=156.00GiB, used=124.35GiB > Data: total=foo, used=bar > System, RAID10: total=128.00MiB, used=48.00KiB > System: total=4.00MiB, used=0.00 > Metadata, RAID10: total=112.00GiB, used=1.38GiB > Metadata: total=foo, used=bar
The lines without the RAID marker are there as a result of the way that mkfs works -- it creates stub chunks which are never used, and then upgrades to the required RAID level immediately afterwards. The balance (any balance, not just a conversion) processes these chunks as well as all the other chunks in the FS, and rewrites all of the data in them (all 0 bytes of it) somewhere else, removing the originals. Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- Well, you don't get to be a kernel hacker simply by looking --- good in Speedos. -- Rusty Russell
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