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Date:      Sun, 03 Feb 2008 22:23:44 +0100
From:      Ivan Voras <ivoras@freebsd.org>
To:        freebsd-stable@freebsd.org
Subject:   Re: gjournal panic 7.0-RC1
Message-ID:  <fo5bd1$h5r$1@ger.gmane.org>
In-Reply-To: <20080203205825.GA62536@in-addr.com>
References:  <3aaaa3a0802030751w69ce59a9oeb869e3d87d92616@mail.gmail.com>	<fo58j1$7hq$1@ger.gmane.org> <20080203205825.GA62536@in-addr.com>

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Gary Palmer wrote:
> On Sun, Feb 03, 2008 at 09:35:44PM +0100, Ivan Voras wrote:

>> If so, this is the same class of errors as ZFS (some would call it=20
>> "tuning errors"), only this time the space reserved for the on-disk=20
>> journal is too small, and the fast drives fill it up before data can b=
e=20
>> transfered from the journal to the data area.
>=20
> Is there something stopping gjournal from temporarily blocking writes
> to the journal to allow it to flush the journaled data to the provider?=


I've done something like that in the past, but I don't know if Pawel's=20
gjournal has this implemented.

I feel that a good solution could be to somehow pause the file system at =

the VFS layer not to generate requests that would result in IO writes -=20
this could (in theory...) help with ZFS.


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