linux-kernel - Re: [Scst-devel] Integration of SCST in the mainstream Linux kernel

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Date:	Tue, 05 Feb 2008 18:09:15 +0100
From:	Matteo Tescione <matteo@...et.it>
To:	FUJITA Tomonori <tomof@....org>, <mangoo@...g.org>
CC:	<vst@...b.net>, <linux-scsi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<James.Bottomley@...senPartnership.com>,
	<scst-devel@...ts.sourceforge.net>, <akpm@...ux-foundation.org>,
	<torvalds@...ux-foundation.org>, <fujita.tomonori@....ntt.co.jp>
Subject: Re: [Scst-devel] Integration of SCST in the mainstream Linux
 kernel

On 5-02-2008 14:38, "FUJITA Tomonori" <tomof@....org> wrote:

> On Tue, 05 Feb 2008 08:14:01 +0100
> Tomasz Chmielewski <mangoo@...g.org> wrote:
> 
>> James Bottomley schrieb:
>> 
>>> These are both features being independently worked on, are they not?
>>> Even if they weren't, the combination of the size of SCST in kernel plus
>>> the problem of having to find a migration path for the current STGT
>>> users still looks to me to involve the greater amount of work.
>> 
>> I don't want to be mean, but does anyone actually use STGT in
>> production? Seriously?
>> 
>> In the latest development version of STGT, it's only possible to stop
>> the tgtd target daemon using KILL / 9 signal - which also means all
>> iSCSI initiator connections are corrupted when tgtd target daemon is
>> started again (kernel upgrade, target daemon upgrade, server reboot etc.).
> 
> I don't know what "iSCSI initiator connections are corrupted"
> mean. But if you reboot a server, how can an iSCSI target
> implementation keep iSCSI tcp connections?
> 
> 
>> Imagine you have to reboot all your NFS clients when you reboot your NFS
>> server. Not only that - your data is probably corrupted, or at least the
>> filesystem deserves checking...

Don't know if matters, but in my setup (iscsi on top of drbd+heartbeat)
rebooting the primary server doesn't affect my iscsi traffic, SCST correctly
manages stop/crash, by sending unit attention to clients on reconnect.
Drbd+heartbeat correctly manages those things too.
Still from an end-user POV, i was able to reboot/survive a crash only with
SCST, IETD still has reconnect problems and STGT are even worst.

Regards,
--matteo


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