Date: Tue, 29 Nov 2005 10:03:02 -0600
From: Chris Adams <cmadams@hiwaay.net>
To: linux-kernel@vger.kernel.org
Subject: Re: what is our answer to ZFS?
Message-ID: <20051129160302.GA1105271@hiwaay.net>
References: <fa.gcocno9.1lgcbap@ifi.uio.no>
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Once upon a time, Theodore Ts'o <tytso@mit.edu> said:
>This isn't actually a new idea, BTW.  Digital's advfs had storage
>pools and the ability to have a single advfs filesystem spam multiple
>filesystems, and to have multiple adv filesystems using storage pool,
>something like ten years ago.

A really nice feature of AdvFS is fileset-level snapshots.  For my Alpha
servers, I don't have to allocate disk space to snapshot storage; the
fileset uses free space within the fileset for changes while a snapshot
is active.  For my Linux servers using LVM, I have to leave a chunk of
space free in the volume group, make sure it is big enough, make sure
only one snapshot exists at a time (or make sure there's enough free
space for multiple snapshots), etc.

AdvFS is also fully integrated with TruCluster; when I started
clustering, I didn't have to change anything for most of my storage.

I will miss AdvFS when we turn off our Alphas for the last time (which
won't be far off I guess; final order date for an HP Alpha system is
less than a year away now).
-- 
Chris Adams <cmadams@hiwaay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.
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