From: Lars Marowsky-Bree <lmb@suse.de>
To: linux kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] ENBD for 2.5.64
Date: Wed, 26 Mar 2003 10:59:15 +0100 [thread overview]
Message-ID: <20030326095915.GL3413@marowsky-bree.de> (raw)
In-Reply-To: <5.1.0.14.2.20030326182627.0387b1a0@mira-sjcm-3.cisco.com>
On 2003-03-26T18:31:31,
Lincoln Dale <ltd@cisco.com> said:
> >Indeed, there are iSCSI implementations that do multipath and
> >failover.
> iSCSI is a transport.
> logically, any "multipathing" and "failover" belongs in a layer above it --
"Multipathing" on iSCSI is actually a layer below - network resiliency is
handled by routing protocols, the switching fabric etc.
> >Both iSCSI and ENBD currently have issues with pending writes during
> >network outages. The current I/O layer fails to report failed writes
> >to fsync and friends.
> these are not "iSCSI" or "ENBD" issues. these are issues with VFS.
Yes, and it is a fairly annoying issue... In particular with ENBD, a partial
write could occur at the block device layer. Now try to report that upwards to
the write() call. Good luck.
Sincerely,
Lars Marowsky-Brée <lmb@suse.de>
--
SuSE Labs - Research & Development, SuSE Linux AG
"If anything can go wrong, it will." "Chance favors the prepared (mind)."
-- Capt. Edward A. Murphy -- Louis Pasteur
next prev parent reply other threads:[~2003-03-26 9:49 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1048623613.25914.14.camel@lotte>
2003-03-25 20:53 ` [PATCH] ENBD for 2.5.64 Peter T. Breuer
2003-03-26 2:40 ` Jeff Garzik
2003-03-26 5:55 ` Matt Mackall
2003-03-26 6:31 ` Peter T. Breuer
2003-03-26 6:48 ` Matt Mackall
2003-03-26 7:05 ` Peter T. Breuer
2003-03-26 6:59 ` Andre Hedrick
2003-03-26 13:58 ` Jeff Garzik
2003-03-26 7:31 ` Lincoln Dale
2003-03-26 9:59 ` Lars Marowsky-Bree [this message]
2003-03-26 10:18 ` Andrew Morton
2003-03-26 13:49 ` Jeff Garzik
2003-03-26 16:09 ` Matt Mackall
[not found] ` <5.1.0.14.2.20030327085031.04aa7128@mira-sjcm-3.cisco.com>
2003-03-26 22:40 ` Matt Mackall
2003-03-28 11:19 ` Pavel Machek
2003-03-30 20:48 ` Peter T. Breuer
2003-03-26 22:16 Lincoln Dale
2003-03-26 22:56 ` Lars Marowsky-Bree
2003-03-26 23:21 ` Lincoln Dale
-- strict thread matches above, loose matches on Subject: below --
2003-03-26 22:16 Lincoln Dale
2003-03-26 22:32 ` Andre Hedrick
[not found] ` <Pine.LNX.4.10.10303261422580.25072-100000@master.linux-ide .org>
2003-03-26 23:03 ` Lincoln Dale
2003-03-26 23:39 ` Andre Hedrick
[not found] <5.1.0.14.2.20030327083757.037c0760@mira-sjcm-3.cisco.com>
2003-03-26 22:02 ` Peter T. Breuer
2003-03-26 23:49 ` Lincoln Dale
2003-03-27 0:08 ` Peter T. Breuer
2003-03-25 17:27 Peter T. Breuer
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