From: kelsey hudson <khudson@tsss.org>
To: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] meaning of -L for snapshots ?
Date: Mon, 19 Dec 2005 16:49:45 -0800 [thread overview]
Message-ID: <43A75529.10809@tsss.org> (raw)
In-Reply-To: <Pine.LNX.4.63.0512191419400.23209@s1.ckr-solutions.com>
Olivier Kaloudoff wrote:
> Who can explain the usage of -L10M for my snapshot ?
LVM snapshots have a limitation to how much data can change before the
snapshot becomes invalid. So, by using -L10M, you're saying to keep the
snapshot around until 10M of data has changed, then the snapshot becomes
invalid.
Because of the way LVM snapshots work, they require extra space on a
volume. So, the size of your snapshot volume dictates how long it will
remain valid. A good rule of thumb is between 10% and 20% of your
primary volume's size. That way, 10 to 20% of the filesystem's contents
can change and your snapshot will remain valid.
Hope this clears some things up for you.
-Kelsey
next prev parent reply other threads:[~2005-12-20 1:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-19 13:33 [linux-lvm] meaning of -L for snapshots ? Olivier Kaloudoff
2005-12-20 0:49 ` kelsey hudson [this message]
2005-12-20 21:43 ` Jonathan Brassow
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