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Date:      Tue, 08 Jul 2008 22:38:10 +0200
From:      Kris Kennaway <kris@FreeBSD.org>
To:        Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
Cc:        John Nielsen <lists@jnielsen.net>, freebsd-questions@freebsd.org
Subject:   Re: FreeBSD + ZFS on a production server?
Message-ID:  <4873D032.7040708@FreeBSD.org>
In-Reply-To: <20080706175206.B5376@wojtek.tensor.gdynia.pl>
References:  <1a5a68400806080604ped08ce8p120fc21107e7de81@mail.gmail.com>	<4F9C9299A10AE74E89EA580D14AA10A61A193E@royal64.emp.zapto.org>	<20080612132527.K5722@wojtek.tensor.gdynia.pl>	<200807060222.40004.lists@jnielsen.net> <20080706175206.B5376@wojtek.tensor.gdynia.pl>

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Wojciech Puchar wrote:

> ZFS can be installed on partitions and share disks with other things, 
> but the performance will be bad.

There is nothing ZFS-specific about this statement.

> ZFS - contrary to every other filesystem that use FreeBSD disk I/O 
> scheduler - does it's own I/O scheduling, so it assumes it's the only 
> user of physical drive.

This is false.  ZFS uses GEOM along with everything else in FreeBSD, and 
GEOM is the thing that eventually talks to the disk driver to perform I/O.

Kris




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