From: Mike Anderson <andmike@us.ibm.com>
To: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Cc: James.Smart@Emulex.Com, linux-scsi@vger.kernel.org
Subject: Re: lpfc: System freezing if fiber is broken
Date: Tue, 26 Jul 2005 11:48:00 -0700 [thread overview]
Message-ID: <20050726184800.GA19810@us.ibm.com> (raw)
In-Reply-To: <42E679A2.1060408@fujitsu-siemens.com>
Bodo Stroesser [bstroesser@fujitsu-siemens.com] wrote:
> Hi James,
>
> disrupting a working FC connection makes my i386 SMP server
> (2.6.12.2) freeze just one or two seconds after this.
> I'm normally using lpfc_nodev_tmo = 1. When I change this to the
> default value of 35, the system stalls about 36 seconds after
> disruption. So I guess, the problem is caused by nodev_tmo
> expiring.
> I activated the nmi_watchdog, but no output.
>
> What can I do to analyze this problem?
Does changing the timeout for a scsi device also alter the problem. In the
past people have seen issues of the nodev_tmo expiring near the scsi
timeout. This past cases lead to devices being offlined, but may this
could be causing a different symptom on your system.
You can change the timeout for the device by echoing a higher value into
/sys/bus/scsi/devices/${nexus}/timeout.
Is this a full system freeze or only the controlling console?
-andmike
--
Michael Anderson
andmike@us.ibm.com
next prev parent reply other threads:[~2005-07-26 18:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-26 17:57 lpfc: System freezing if fiber is broken Bodo Stroesser
2005-07-26 18:48 ` Mike Anderson [this message]
2005-07-27 13:45 ` Bodo Stroesser
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