Date: Wed, 5 May 2010 09:28:54 -0700 From: Freddie Cash <fjwcash@gmail.com> To: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: Different sizes between zfs list and zpool list Message-ID: <p2lb269bc571005050928of3c258a6re8e80aa2262a14ae@mail.gmail.com> In-Reply-To: <AANLkTilN2XiX7ZsqcXIL-UfSCZtdloLkaW5r9_0RYsLV@mail.gmail.com> References: <AANLkTim-yHHl9Neeb40gD3W333foqEIcGYCY2EaorvKg@mail.gmail.com> <l2jb269bc571005050856w86b6f13as54a8778c28dd9099@mail.gmail.com> <AANLkTilN2XiX7ZsqcXIL-UfSCZtdloLkaW5r9_0RYsLV@mail.gmail.com>
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On Wed, May 5, 2010 at 9:20 AM, Tom Evans <tevans.uk@googlemail.com> wrote: > On Wed, May 5, 2010 at 4:56 PM, Freddie Cash <fjwcash@gmail.com> wrote: > > On Wed, May 5, 2010 at 8:44 AM, Tom Evans <tevans.uk@googlemail.com> > wrote: > > > >> When looking at the size of a pool, this information can be got from > >> both zpool list and zfs list: > >> > >> > $ zfs list > >> NAME USED AVAIL REFER MOUNTPOINT > >> tank 5.69T 982G 36.5K /tank > >> > >> > $ zpool list > >> NAME SIZE USED AVAIL CAP HEALTH ALTROOT > >> tank 8.14T 6.86T 1.28T 84% ONLINE - > >> > >> Why the different sizes? > >> The pool is a raidz of 6 x 1.5 TB drives. > >> > > > > zpool lists the raw storage available to the pool. Every single bit of > > every single drive is listed here. This will be 6 x 1 TB. > > > > zfs lists only the amount of storage available to be used, after all > > redundancy is taken into account. This will be 5 x 1 TB. > > Ah, that makes sense - also explains why the df output matches up > precisely with the zfs list output. > Things get really interesting once you enable compression on a filesystem, as then du, df, and zfs list will all be different. :) There's a great post on the zfs-discuss mailing list that covers this. I'll see if I can dig it up. -- Freddie Cash fjwcash@gmail.com
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