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Re: write errors on secondary scsi LUNs

To: Arjen Wolfs <arjen@xxxxxxxx>
Subject: Re: write errors on secondary scsi LUNs
From: Steve Lord <lord@xxxxxxx>
Date: Tue, 23 Oct 2001 05:05:05 -0500
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: Message from Arjen Wolfs <arjen@euro.net> of "Tue, 23 Oct 2001 10:18:42 +0200." <5.1.0.14.2.20011022113021.02721150@pop.euronet.nl>
Sender: owner-linux-xfs@xxxxxxxxxxx
Hi Arjen,

I suspect you are being hit by the scsi layer here - you are seeing two
error reports, the first one is the scsi layer reporting an error, the
second is xfs reporting it got an I/O error from the scsi layer.
Apart from hex vs decimal, they are both complaining about the same
disk block.

Have you tried some raw I/O tests to the same device without a filesystem
on it?

Steve

> 
> Hi,
> 
> I have two hardware raid partitions, on an identical SCSI ID; one with LUN 
> 0, one with LUN 1. The partition on LUN 1, which consists of brand new hard 
> disks, is generating random write errors of the kind:
> 
> SCSI disk error : host 2 channel 0 id 0 lun 1 return code = 8
>   I/O error: dev 08:21, sector 310378498
> XFS: device 0x821- XFS write error in file system meta-data block 
> 0x12800002 in sd(8,33)
> 
> SCSI disk error : host 2 channel 0 id 0 lun 1 return code = 8
>   I/O error: dev 08:21, sector 310397560
> 
> Oddly enough, xfs_check and xfs_repair can't find anything wrong with it 
> after this happens. Considering kernels before 2.4.10 would not even 
> recognize SCSI devices on LUNs other than 0, I am not entirely sure wether 
> this is an XFS or a SCSI issue. Anybody have any ideas?
> 
> TIA,
> Arjen Wolfs



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