zfs and disk write cache

Joerg t tjoerg at yahoo.com
Mon May 7 18:23:29 UTC 2007

thanks for clarifying, Pawel!

----- Original Message ----
From: Pawel Jakub Dawidek <pjd at FreeBSD.org>
To: Joerg t <tjoerg at yahoo.com>
Cc: freebsd-current <freebsd-current at freebsd.org>
Sent: Monday, May 7, 2007 2:04:34 PM
Subject: Re: zfs and disk write cache

On Mon, May 07, 2007 at 09:34:20AM -0700, Joerg t wrote:
> Does zfs on FreeBSD also disables the disk write cache like on Solaris if we give only a slice of the disk ?

No. On Solaris write cache is disabled by default AFAIK, because of UFS,
so ZFS on Solaris doesn't turn on write cache when it is configured on a
slice, because another slice may have UFS. On FreeBSD write cache is
enabled by default, so ZFS bascially doesn't touch it.

Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!

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