On 2012-Nov-19 21:10:56 +0100, Jim Klimov <jimkli...@cos.ru> wrote: >On 2012-11-19 20:28, Peter Jeremy wrote: >> Yep - that's the fallback solution. With 1874 snapshots spread over 54 >> filesystems (including a couple of clones), that's a major undertaking. >> (And it loses timestamp information). > >Well, as long as you have and know the base snapshots for the clones, >you can recreate them at the same branching point on the new copy too.
Yes, it's just painful. >Also, while you are at it, you can use different settings on the new >pool, based on your achieved knowledge of your data This pool has a rebuild in its future anyway so I have this planned. - perhaps using >better compression (IMHO stale old data that became mostly read-only >is a good candidate for gzip-9), setting proper block sizes for files >of databases and disk images, maybe setting better checksums, and if >your RAM vastness and data similarity permit - perhaps employing dedup After reading the horror stories and reading up on how dedupe works, this is definitely not on the list. >(run "zdb -S" on source pool to simulate dedup and see if you get any >better than 3x savings - then it may become worthwhile). Not without lots more RAM - and that would mean a whole new box. >Perhaps, if the "zfs diff" does perform reasonably for you, you can >feed its output as the list of objects to replicate in rsync's input >and save many cycles this way. The starting point of this saga was that "zfs diff" failed, so that isn't an option. On 2012-Nov-19 21:24:19 +0100, Jim Klimov <jimkli...@cos.ru> wrote: >fatally difficult scripting (I don't know if it is possible to fetch >the older attribute values from snapshots - which were in force at >that past moment of time; if somebody knows anything on this - plz >write). The best way to identify past attributes is probably to parse "zfs history", though that won't help for "received" attributes. -- Peter Jeremy
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