[EMAIL PROTECTED] wrote on 09/25/2008 09:16:48 AM:
> On 25 Sep 2008, at 14:40, Ross wrote:
>
> > For a default setup, I would have thought a years worth of data
> > would be enough, something like:
>
> Given that this can presumably be configured to suit everyone's
> particular data retention plan, for a default setup, what was
> originally proposed seems obvious and sensible to me.
>
> Going slightly off-topic:
>
> All this auto-snapshot stuff is ace, but what's really missing, in my
> view, is some easy way to actually determine where the version of the
> file you want is. I typically find myself futzing about with diff
> across a dozen mounted snapshots trying to figure out when the last
> good version is.
>
> It would be great if there was some way to know if a snapshot contains
> blocks for a particular file, i.e., that snapshot contains an earlier
> version of the file than the next snapshot / now. If you could do that
> and make ls support it with an additional flag/column, it'd be a real
> time-saver.
>
> The current mechanism is especially hard as the auto-mount dirs can
> only be found at the top of the filesystem so you have to work with
> long path names. An fs trick to make .snapshot dirs of symbolic links
> appear automagically would rock, i.e.,
>
> % cd /foo/bar/baz
> % ls -l .snapshot
> [...] nightly.0 -> /foo/.zfs/snapshot/nightly.0/bar/baz
> % diff {,.snapshot/nightly.0/}importantfile
>
> Yes, I know this last command can just be written as:
>
> % diff /foo/{,.zfs/snapshot/nightly.0}/bar/baz/importantfile
>
> but this requires me to a) type more; and b) remember where the top of
> the filesystem is in order to split the path. This is obviously more
> of a pain if the path is 7 items deep, and the split means you can't
> just use $PWD.
>
I use a perl script that emulates ls, but in addition of listing the files
in the current directory looks at the timestamps of each zfs snap to see if
there are different versions and shows the FQ path and timestmp info for
each unique version. files that exist in the snapshot, but not in the
current list are shown last (with their timetamps). I suppose a
backup/restore like gui interface would be relatively simple to build with
the same principle.
My code is in horrible shape (wrote it as a one off, but it works). If
there is interest I can cleanup and post.
> [My choice of .snapshot/nightly.0 is a deliberate nod to the
> competition ;-)]
>
> Jonathan
>
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