On 16-Jan-10, at 7:30 AM, Edward Ned Harvey wrote:
I am considering building a modest sized storage system with zfs.
Some
of the data on this is quite valuable, some small subset to be backed
up "forever", and I am evaluating back-up options with that in mind.
You don't need to store the "zfs send" data stream on your backup
media.
This would be annoying for the reasons mentioned - some risk of
being able
to restore in future (although that's a pretty small risk) and
inability to
restore with any granularity, i.e. you have to restore the whole FS
if you
restore anything at all.
A better approach would be "zfs send" and pipe directly to "zfs
receive" on
the external media. This way, in the future, anything which can
read ZFS
can read the backup media, and you have granularity to restore
either the
whole FS, or individual things inside there.
There have also been comments about the extreme fragility of the data
stream compared to other archive formats. In general it is strongly
discouraged for these purposes.
--Toby
Plus, the only way to guarantee the integrity of a "zfs send" data
stream is
to perform a "zfs receive" on that data stream. So by performing a
successful receive, you've guaranteed the datastream is not
corrupt. Yet.
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