lkml.org 
[lkml]   [2003]   [Mar]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] ENBD for 2.5.64
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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:34    [from the cache]
©2003-2011 Jasper Spaans