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Re: Problem with file system on iSCSI FileIO

To: Slawomir Nowakowski <slawomir.nowakowski@xxxxxxxxxx>
Subject: Re: Problem with file system on iSCSI FileIO
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Fri, 24 Sep 2010 03:55:05 -0400
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, Artur Piechocki <artur.piechocki@xxxxxxxxxx>, ??ukasz Wittig <lukasz.wittig@xxxxxxxxxx>, "'Ryszard Stawiarski'" <ryszard.stawiarski@xxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <4C9B6B27.5050606@xxxxxxxxxx>
References: <4C9B5786.4010205@xxxxxxxxxx> <20100923143221.GA1989@xxxxxxxxxxxxx> <4C9B6B27.5050606@xxxxxxxxxx>
User-agent: Mutt/1.5.20 (2009-08-17)
On Thu, Sep 23, 2010 at 04:58:47PM +0200, Slawomir Nowakowski wrote:
> iSCSI FileIO is using struct file that serves it as block level
> device via iSCSI technology:
> http://en.wikipedia.org/wiki/ISCSI

Thanks, I know ISCSI very well.  But what is "iSCSI FileIO" ?  The above
sounds like it's an iscsi target, is that correct?

> There are RAID level 6 unit on the Areca RAID controller (1680). On
> the unit is created a volume group. In the volume group we have
> several logical volumes. The iSCSI FileIO volume is mounted and the
> file (lun) is served via SCST target as iSCSI LUN.
> We have checked RAM with memtest+ and verified RAID unit health and
> no issues were found.

I still can't make any sense of the actual setups.

The above seems to be the backend storage.  Then there's SCST somewhere
in which is in a out of tree kernel module.  And then you use XFS
somewhere.  Please provide a full description of the setup.

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