Date: Wed, 06 Sep 2006 16:09:13 +0200 From: Philippe Pegon <Philippe.Pegon@crc.u-strasbg.fr> To: =?ISO-8859-1?Q?Ulrich_Sp=F6rlein?= <ulrich.spoerlein@1822direkt.com> Cc: stable@freebsd.org Subject: Re: Snapshot duration, performance and how to avoid I/O lock Message-ID: <44FED689.8070202@crc.u-strasbg.fr> In-Reply-To: <239947161@misc1.1822direkt.com> References: <239947161@misc1.1822direkt.com>
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Ulrich Spörlein wrote: > Hi, Hi, > I have to create regular snapshots of several volumes roughly 1.4TB in > size (each). But using mksnap_ffs takes a lot of time (45 minutes) and > it looks like it could be speed up. [snip] > Another thing is blocking other disk I/O while snapshotting. Right now I did > a ls(1) in the .snap directory, so I understand the filesystem is now suspended. > The workaround would then be to "dont do that". But what if other snapshots are > accessed during that time? I want to provide yesterdays snapshot to our users > while taking the current snapshot and providing access to the newest data at the > same time. I had seen that a long time ago (on another controller), and it seems it's not better today, our post from june 2005 without response at the end : http://docs.freebsd.org/cgi/getmsg.cgi?fetch=410600+0+archive/2005/freebsd-stable/20050612.freebsd-stable http://docs.freebsd.org/cgi/getmsg.cgi?fetch=463968+0+archive/2005/freebsd-stable/20050612.freebsd-stable -- Philippe Pegon
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