Re: [zfs-discuss] snapshot size
> Can I say > > USED-REFER=snapshot size ? No. "USED" is the space that would be freed if you destroyed the snapshot _right now_. This can change (and usually does) if you destroy previous snapshots. ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] snapshot size
Le 05/06/2012 ? 17:08:51+0200, Stefan Ring a écrit > > Two questions from a newbie. > > > > 1/ What REFER mean in zfs list ? > > The amount of data that is reachable from the file system root. It's > just what I would call the contents of the file system. OK thanks. > > > 2/ How can I known the size of all snapshot size for a partition ? > > (OK I can add zfs list -t snapshot) > > zfs get usedbysnapshots Thansk Can I say USED-REFER=snapshot size ? Regards. JAS -- Albert SHIH DIO bâtiment 15 Observatoire de Paris 5 Place Jules Janssen 92195 Meudon Cedex Téléphone : 01 45 07 76 26/06 86 69 95 71 xmpp: j...@jabber.obspm.fr Heure local/Local time: mar 5 jui 2012 17:16:07 CEST ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] snapshot size
> Two questions from a newbie. > > 1/ What REFER mean in zfs list ? The amount of data that is reachable from the file system root. It's just what I would call the contents of the file system. > 2/ How can I known the size of all snapshot size for a partition ? > (OK I can add zfs list -t snapshot) zfs get usedbysnapshots Or if you have a recent enough system, have a look at the "written" property: http://blog.delphix.com/matt/files/2011/11/oss.pdf (pg 8). ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
[zfs-discuss] snapshot size
Hi all, Two questions from a newbie. 1/ What REFER mean in zfs list ? 2/ How can I known the size of all snapshot size for a partition ? (OK I can add zfs list -t snapshot) Regards. JAS -- Albert SHIH DIO bâtiment 15 Observatoire de Paris 5 Place Jules Janssen 92195 Meudon Cedex Téléphone : 01 45 07 76 26/06 86 69 95 71 xmpp: j...@jabber.obspm.fr Heure local/Local time: mar 5 jui 2012 16:57:38 CEST ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
[zfs-discuss] Snapshot size as reported by the USED property
I create snapshots on my datasets quite frequently. My understanding of the USED property of a snapshot is that it indicates the amount of data that was written to the dataset after the snapshot was taken. But now I'm seeing a snapshot with USED == 0 where there was definitely write activity after it was taken. Is my understanding wrong or do I see a thing that is not supposed to happen? I am on NCP3. Thanks, Peter -- This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Snapshot size larger than expected
OK, to answer my own question (with a little help from Eric!) ... I was using vi to edit the file which must be rewriting the entire file back out to disk - hence the larger than expected growth of the snapshot. Matt This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Snapshot size larger than expected
How are you editing the file? Are you sure your editor isn't writing out the entire file even though only four characters have changed? If you truss the app, do you see a single 4 byte write to the file? - Eric On Wed, Jan 23, 2008 at 11:11:38AM -0800, Matt Newcombe wrote: > Hi, > > We're currently testing a Thumper running Solaris10 with a view to buying a > couple. > > I'm not seeing what I would expect to see as far as snapshot space > utilization and am hoping someone could explain why. > > Here's what I'm doing - > > Creating an empty zpool & zfs > Creating a 6MB text file > Taking a snapshot > > So far so good. The filesystem size is 6MB and the snapshot 0MB > > Now I edit the first 4 characters of the text file. I would have expected the > size of the snapshot to have grown by the size of the changed *blocks* but > when I do a 'zfs list' the filesystem is now reported as being around 12MB > total with the snapshot around 6MB. > > So the snapshot is being reported as being the size of the changed *files* > and not the changed *blocks*. Is this corret (that the snapshot is consuming > this space) or is that just how it's being reported with th zfs list command? > > Many thanks - Matt > > > This message posted from opensolaris.org > ___ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss -- Eric Schrock, Fishworkshttp://blogs.sun.com/eschrock ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Snapshot size larger than expected
On Wed, Jan 23, 2008 at 11:11:38AM -0800, Matt Newcombe wrote: > Creating an empty zpool & zfs > Creating a 6MB text file > Taking a snapshot > > So far so good. The filesystem size is 6MB and the snapshot 0MB > > Now I edit the first 4 characters of the text file. I would have > expected the size of the snapshot to have grown by the size of the > changed *blocks* but when I do a 'zfs list' the filesystem is now > reported as being around 12MB total with the snapshot around 6MB. How did you edit the file? Are you sure that the editor didn't just create a temporary file and rename it (thus updating every block)? -- Darren Dunham [EMAIL PROTECTED] Senior Technical Consultant TAOShttp://www.taos.com/ Got some Dr Pepper? San Francisco, CA bay area < This line left intentionally blank to confuse you. > ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
[zfs-discuss] Snapshot size larger than expected
Hi, We're currently testing a Thumper running Solaris10 with a view to buying a couple. I'm not seeing what I would expect to see as far as snapshot space utilization and am hoping someone could explain why. Here's what I'm doing - Creating an empty zpool & zfs Creating a 6MB text file Taking a snapshot So far so good. The filesystem size is 6MB and the snapshot 0MB Now I edit the first 4 characters of the text file. I would have expected the size of the snapshot to have grown by the size of the changed *blocks* but when I do a 'zfs list' the filesystem is now reported as being around 12MB total with the snapshot around 6MB. So the snapshot is being reported as being the size of the changed *files* and not the changed *blocks*. Is this corret (that the snapshot is consuming this space) or is that just how it's being reported with th zfs list command? Many thanks - Matt This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
