Date: Tue, 13 Mar 2007 20:36:16 +0100 From: "Pietro Cerutti" <pietro.cerutti@gmail.com> To: "Bill Moran" <wmoran@potentialtech.com> Cc: questions@freebsd.org Subject: Re: UFS2 Snapshot limitiations Message-ID: <e572718c0703131236q55ec3549w9708ab5304434433@mail.gmail.com> In-Reply-To: <20070313151425.5fc464db.wmoran@potentialtech.com> References: <64784.69.129.174.18.1173797935.squirrel@email.polands.org> <20070313111029.49bd1d14.wmoran@potentialtech.com> <53038.69.129.174.18.1173799128.squirrel@email.polands.org> <e572718c0703131114t66db9547x610f8771148fcdd3@mail.gmail.com> <20070313143555.ee27a265.wmoran@potentialtech.com> <e572718c0703131148x3f1ce9f4yf58597f53d841e48@mail.gmail.com> <20070313151425.5fc464db.wmoran@potentialtech.com>
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On 3/13/07, Bill Moran <wmoran@potentialtech.com> wrote: > In response to "Pietro Cerutti" <pietro.cerutti@gmail.com>: > > > On 3/13/07, Bill Moran <wmoran@potentialtech.com> wrote: > > > In response to "Pietro Cerutti" <pietro.cerutti@gmail.com>: > > > > > > > On 3/13/07, Doug Poland <doug@polands.org> wrote: > > > > > > > > > > On Tue, March 13, 2007 10:10, Bill Moran wrote: > > > > > > In response to "Doug Poland" <doug@polands.org>: > > > > > > > > > > > >> Hello, > > > > > >> > > > > > >> I seem to recall, but cannot find, the limitation on the number of > > > > > >> snapshots allowed on UFS2. Could someone point me in the right > > > > > >> direction please? > > > > > > > > > > > > The handbook has it: > > > > > > http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/snapshots.html > > > > > > > > > > > Thank you very much. > > > > > > > > > > > > > Sorry for joining the thread, but it's raised my curiosity: what's the > > > > reason for this limit? > > > > > > I'm not 100% sure, but I believe it's because snapshot information is stored > > > in the filesystem superblock, and that's all that can fit in the space > > > available in the superblock. > > > > This is the same thing that came to my mind, but in the handbook page I found: > > "Active snapshots are recorded in the superblock so they are > > persistent across unmount and remount operations along with system > > reboots." > > > > 1) what an "active" snapshot is? > > I think you're trying too hard to read into this. Active snapshot, as opposed > to a snapshot that has been deleted/unmounted and existed in the past, is what > I took it to mean. Makes sense. Thanks! > > -- > Bill Moran > http://www.potentialtech.com > -- Pietro Cerutti - ASCII Ribbon Campaign - against HTML e-mail and proprietary attachments www.asciiribbon.org
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