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Date:      Fri, 21 Sep 2007 13:35:47 +0200
From:      Ivan Voras <ivoras@freebsd.org>
To:        freebsd-fs@freebsd.org
Subject:   Re: Writing contigiously to UFS2?
Message-ID:  <fd0aaj$poh$1@sea.gmane.org>
In-Reply-To: <46F3A64C.4090507@fluffles.net>
References:  <46F3A64C.4090507@fluffles.net>

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Fluffles wrote:

> Even worse: data is being stored at weird locations, so that my energy =

> efficient NAS project becomes crippled. Even with the first 400GB of=20
> data, it's storing that on the first 4 disks in my concat configuration=
,=20

> In the past when testing geom_raid5 I've tried to tune newfs parameters=
=20
> so that it would write contiguously but still there were regular 2-phas=
e=20
> writes which mean data was not written contiguously. I really dislike=20
> this behavior.

I agree, this is my least favorite aspect of UFS (maybe together with=20
nonimplementation of extents), for various reasons. I feel it's time to=20
start heavy lobbying for finishing FreeBSD's implementations of XFS and=20
raiserfs :)

(ZFS is not the ultimate solution: 1) replacing UFS monoculture with ZFS =

monoculture will sooner or later yield problems, and 2) sometimes a=20
"dumb" unix filesystem is preferred to the "smart" ZFS).


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