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Re: XFS errors on large Infiniband fileserver setup

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: XFS errors on large Infiniband fileserver setup
From: Christian Herzog <horeizo@xxxxxxxxxxxx>
Date: Thu, 23 Sep 2010 13:52:46 +0200
Cc: <xfs@xxxxxxxxxxx>
In-reply-to: <20100923103802.GA16984@xxxxxxxxxxxxx>
References: <29252416bd0d9dc973a909e411dbec6a@xxxxxxxxxxxx> <eb1b2cfa58cddc44c92c3a87a0e0a6c4@xxxxxxxxxxxx> <20100923103802.GA16984@xxxxxxxxxxxxx>
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> Yes, that could very well possible.  While I'm not an expert on iSER it
> looks like it doesn't use the software crc32c checksums in iscsi over
> TCP but relies on the RDMA protocols guaranteeing it.
that would explain quite a lot actually. Thanks for the hint.

> Btw, what target do you use?  According to
> http://www.spinics.net/lists/linux-stgt/msg02038.html it seems like the
> stgt iser target has some issues that look quite similar to yours.
we're using tgt which might have a similar problem.

As even IB over TCP is several times faster than our disks, we will now
proceed w/o iSER to have the system running and then experiment with
iSER on a test system.

thanks,
-Christian

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