linux-kernel - Re: [Announce]: Target_Core_Mod/ConfigFS and LIO-Target v3.0 work

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Date:	Sat, 13 Dec 2008 10:41:53 +0100
From:	"Bart Van Assche" <bart.vanassche@...il.com>
To:	Valdis.Kletnieks@...edu
Cc:	nab@...nel.org, linux-iscsi-target-dev@...glegroups.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, "Christoph Hellwig" <hch@....de>,
	"FUJITA Tomonori" <fujita.tomonori@....ntt.co.jp>,
	"James Bottomley" <James.Bottomley@...senpartnership.com>,
	"Mike Christie" <michaelc@...wisc.edu>,
	"Hannes Reinecke" <hare@...e.de>,
	"Jens Axboe" <jens.axboe@...cle.com>
Subject: Re: [Announce]: Target_Core_Mod/ConfigFS and LIO-Target v3.0 work

On Sat, Dec 13, 2008 at 7:20 AM,  <Valdis.Kletnieks@...edu> wrote:
> On Fri, 12 Dec 2008 01:40:09 PST, "Nicholas A. Bellinger" said:
>
>> Too bad, because you are missing out on the most advanced ConfigFS
>> enabled storage engine on the planet.
>
> OK. I *have* to ask.. ;)
>
> What's the *second* most advanced configfs-enabled storage engine?

Please don't let Nicholas Bellinger mislead you. The most important
aspect of a storage engine is stability. Last January I ran
performance tests on IET, STGT, SCST and LIO. I quickly found out not
only that SCST had the highest throughput and the lowest latency, but
also that the performance tests on LIO triggered several kernel
crashes. I have reported these crashes to the linux-iscsi-target-dev
mailing list, but even as of today, it's not yet clear whether all of
these crashes have been fixed. During the last ten years I have filed
bug reports for many open source projects, and the LIO project is the
only project where the (kernel) crashes I reported were not addressed
immediately.

See also:
* February 1, 2008, LIO kernel panic during configuration,
http://groups.google.com/group/linux-iscsi-target-dev/browse_thread/thread/74c8b37f24b84e59/d94c07626bd20521?lnk=gst&q=kernel+panic#d94c07626bd20521.
* February 8, 2008, kernel crash triggered by LIO,
http://groups.google.com/group/linux-iscsi-target-dev/browse_thread/thread/30835aede1028188/5708e16a23367fb4?lnk=gst&q=kernel+crash#5708e16a23367fb4.
* February 13, 2008, LIO target kernel code triggers memory
corruption, http://groups.google.com/group/linux-iscsi-target-dev/browse_thread/thread/ddc1bf7666372972/2150a09f9ed3d1cd?lnk=gst&q=ipoib#2150a09f9ed3d1cd.
* February 18, 2008, LIO target makes entire system hang,
http://groups.google.com/group/linux-iscsi-target-dev/browse_thread/thread/6a76f9efd9409fc5/55bd8840b6a5f757?lnk=gst&q=lio+target+hangs#55bd8840b6a5f757.

Bart.
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