I have had some success using zfs send recv into a child of a
compressed filesystem to do this although you have the disadvantage
of losing your settings.
basically :
zfs create tank/foo
mv a bunch of files into foo
zfs create tank/bar
zfs set compression=on bar
zfs snapshot tank/[EMAIL PROTECTED]
zfs send tank/[EMAIL PROTECTED] | zfs recv tank/bar/foosmall
zfs destroy tank/foo
zfs set compression=on tank/bar/foosmall
zfs rename tank/bar/foosmall tank/foo
kinda clunky and you have to have twice as much space available and
there are probably other issues with it as I am not a pro zfs user
here but, worked for me =)
Asa
On Jul 2, 2007, at 5:32 AM, Carson Gaspar wrote:
> roland wrote:
>
>> is there a reliable method of re-compressing a whole zfs volume
>> after turning on compression or changing compression scheme ?
>
> It would be slow, and the file system would need to be idle to avoid
> race conditions, and it wouldn't be very fast, but you _could_ do the
> following (POSIX shell syntax). I haven't tested this, so it could
> have
> typos or other problems:
>
> find . -type f -print | while read n; do
> TF="$(mktemp ${n%/*}/.tmpXXXXXX)"
> if cp -p "$n" "$TF"; then
> if ! mv "$TF" "$n"; then
> echo "failed to re-write $n in mv"
> rm "$TF"
> fi
> else
> echo "failed to re-write $n in cp"
> rm "$TF"
> fi
> done
>
> --
> Carson
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> zfs-discuss@opensolaris.org
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