On Tue, Jan 14, 2014 at 09:30:14AM +0000, Duncan wrote: > Chris Murphy posted on Tue, 14 Jan 2014 00:49:13 -0700 as excerpted: > > > On Jan 13, 2014, at 11:03 PM, Duncan <1i5t5.dun...@cox.net> wrote: > > > >> Chris Murphy posted on Mon, 13 Jan 2014 17:40:33 -0700 as excerpted: > >> > >>> btrfs-image -c 9-t 4 /dev/sdX /mnt/<pathtoanothervolume+filename> > >>> > >>> You can keep it handy in case a dev asks for it or you can attach it > >>> to a kernel.org bug report. > >> > >> How big are they? manpage says it's metadata only (data is zeroed), > >> so I'd guess one could expect it to be about metadata size as reported > >> by btrfs fi df? > > > > # btrfs fi df /mnt/isos > > Metadata, DUP: total=1.00GiB, used=289.53MiB > > > > 193M -rw-r--r--. 1 root root 193M Jan 14 00:44 sdb.img > > > > Guess that's too big to attach to a bugzilla bug. > > ~ 290 MiB metadata, ~ 190 MiB btrfs-image. So roughly 2/3 the size of > metadata. Metadata minus file tails (which are actually data, thus > should be zeroed)? > > Thanks. > > I wonder if it compresses?
Yes, that's the -c9 option, and it compresses fairly well. 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 --- Questions are a burden, and answers a prison for oneself. ---
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