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Date: Fri, 07 Mar 2008 15:26:03 +0100
From: Miroslav Lachman <000.fbsd@quip.cz>
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To: Eric Anderson <anderson@freebsd.org>
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Cc: freebsd-geom@freebsd.org
Subject: Re: GEOM_JOURNAL: Cannot suspend file system /vol0 (error=35)
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Eric Anderson wrote:
> Miroslav Lachman wrote:
> 
>> Hi,
>>
>> today I saw this error in messages:
>>
>> : fsync: giving up on dirty
>> : 0xc5564110: tag devfs, type VCHR
>> : usecount 1, writecount 0, refcount 78 mountedhere 0xc54ef800
>> : flags ()
>> : v_object 0xc556645c ref 0 pages 1146
>> : lock type devfs: EXCL (count 1) by thread 0xc5236a50 (pid 39)
>> : dev mirror/gm0s2e.journal
>> : GEOM_JOURNAL: Cannot suspend file system /vol0 (error=35).
>>
>> Is it something harmful, or is it "normal" behavior? It was in time 
>> when generating backup (high disk I/O).
>> Gjournal is on top of gmirrored SATA disks.
>>
>> mirror/gm0s2d is 2GB journal provider
>> mirror/gm0s2e.journal is 380GB data provider
> 
> 
> 
> This shouldn't be a problem really.  If these are on SCSI disks, you 
> might try increasing the queue depth using camcontrol (see the 'tags' 
> command in the camcontrol man page).  You could also try reducing the 
> journal flush time (I can't recall the sysctl to set right now - I think 
> the default is 10s).

It is on SATA II drives (Hitachi HDP725050GLA360).

Do you mean kern.geom.journal.switch_time ?
(I have set it to default = 10s)
I can try to lower it to 5s, but I think 10s is enough for 2GB journal. 
(10s is default for default 1GB journal size, or am I wrong?)

Miroslav Lachman