Re: [ANNOUNCE] Ext3 vs Reiserfs benchmarks

From: Rik van Riel (riel@conectiva.com.br)
Date: Thu Jul 18 2002 - 10:09:40 EST


On Thu, 18 Jul 2002, Bill Davidsen wrote:

> I think I'm missing a part of this, the "a snapshot is created" sounds a
> lot like "here a miracle occurs." Where is this snapshot saved? And how
> do you take it in one sec regardless of f/s size?

LVM. Systems like LVM already provide a logical->physical block
mapping on disk, so they might as well provide multiple mappings.

If the live filesystem writes to a particular disk block, the
snapshot will keep referencing the old blocks while the filesystem
gets to work on its own data. Copy on Write snapshots for block
devices...

regards,

Rik

-- 
Bravely reimplemented by the knights who say "NIH".

http://www.surriel.com/ http://distro.conectiva.com/

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