RE: ZFS snapshots
- From: "Kevin Closson" <kevinc@xxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 12 Dec 2006 09:30:53 -0800
I can only talk about filesystem snapshots that I know. With veritas and
the upcoming
polyserve snapshots, if all files are in one directory, a snapshot looks
EXACTLY like a
database that was running on a system where the power was turned on.
Exactly.
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Donahue, Adam
Sent: Tuesday, December 12, 2006 6:59 AM
To: Kerber, Andrew; oracle-l@xxxxxxxxxxxxx
Subject: RE: ZFS snapshots
Well, a ZFS snapshot is atomic - meaning, it's not like copying
a datafile in that it doesn't read things block-by-block, meaning the
file can change underneath you while you copy it. Instead, because of
the way ZFS works, it merely marks an existing "uberblock" to be
preserved, which is a single, atomic state of the filesystem as of a
given time.
I admit it's not clean - even if it works. But I'm curious if
I'm missing something that would make it not work at all in some cases.
is not indicative of future returns.
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