On 11/03/08 13:18, Philip Brown wrote:
Ok, I think I understand. You're going to be told
that ZFS send isn't a backup (and for these purposes
I definately agree), ...
Hmph. well, even for 'replication' type purposes, what I'm talking about is
quite useful.
Picture two remote systems, which happen to have "mostly identical" data.
Perhaps they were manually synced at one time with tar, or something.
Now the company wants to bring them both into full sync... but first analyze
the small differences that may be present.
um, /usr/bin/rsync ?
but agreed, not for huge amounts of data...
In that scenario, it would then be very useful, to be able to do the following:
hostA# zfs snapshot /zfs/[EMAIL PROTECTED]
hostA# zfs send /zfs/[EMAIL PROTECTED] | ssh hostB zfs receive /zfs/[EMAIL
PROTECTED]
hostB# diff -r /zfs/prod /zfs/prod/.zfs/snapshots/A >/tmp/prod.diffs
One could otherwise find "files that are different", with rsync -avn. But doing it with
zfs in this way, "adds value", by allowing you to locally compare old and new files on
the same machine, without having to do some ghastly manual copy of each different file, to a new
place, and doing the compare there.
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