Thanks!
So Rik, hope you get what u want. :P
ming
On Mon, 2006-02-27 at 00:10 -0800, Nicholas A. Bellinger wrote:
> Greetings All!
>
> Registered iSCSI logical units provided to the host OSes SCSI subsystem
> speaking ERL=2 can preform session continuation within the context of
> its own iSCSI Nexus. Traditional outernexus multipath software
> (dm-multipath, MPIO, and others) require multiple iSCSI sessions to be
> created to different ISIDs to same or different iSCSI TPG+LUN tuples in
> order to perform their SCSI multipath recovery. The latter does this
> and determines recovery logic using SCSI level SPC opcodes to test for
> nexus establishment.
>
> Connection recovery at the iSCSI level can make this happen very quickly
> by detecting NOP response timeouts, link layer failures, TCP connection
> resets and all types of ERL=1 events. So ERL=2 is benefical for all
> types of storage devices (drives, tapes, CD/DVD roms) and allows less
> reliable links (think wireless) to continue iSCSI IO operation in the
> face of communication path failures and resets.
>
> Thanks :-) !
>
> Oh btw, core-iscsi is alive, it is currently in stable release and
> accepting feature requests. Please check out the following wiki entry
> for more information:
>
> http://www.linux-iscsi.org/index.php/Core-iscsi_Interopt
>
> --
> Nicholas A. Bellinger <nickb@xxxxxxxx>
>
>
> > > > On Sun, 2006-02-26 at 07:54 -0800, Rik Herrin wrote:
> > > > > Thanks for your reply Ming. I understand that PyX
> > > > > supports erl=2, but is it really important? If you
> > > > > use HeaderDigest and BodyDigest (CRC32C) and since
> > > > > iSCSI uses TCP, doesn't that take care of most errors?
> > > > > I read the following: "However, just about every
> > > > > vendor I questioned dismisses iSCSI error recovery
> > > > > level 2 as unnecessary, at least for the time being,
> > > > > because the protocol is already built on a robust
> > > > > networking transport such as TCP, which already
> > > > > guarantees data delivery and provides error checking.
> > > > > [Sep. 2004]" "Nevertheless, many agree that iSCSI
> > > > > error recovery level 2 could be useful in some cases.
> > > > > For example, in case of errors, when the target device
> > > > > is a tape, level 2 would allow the operation to
> > > > > continue without having to restart."
> > > > > (http://www.infoworld.com/article/04/09/03/36storinside_1.html
> > > > > ) So isn't erl=2 only really useful for things such
> > > > > as tapes? Wouldn't the initiator also have to support
> > > > > it? How many initiators currently support erl=2? I
> > > > > read that PyX used to have an initiator (core-scsi)
> > > > > but that it's been discontinued. Thanks for your
> > > > > input.
> > > > >
> > > > >
> > > > > --- Ming Zhang <mingz@xxxxxxxxxxx> wrote:
> > > > >
> > > > > > as far as i know, there is no such comparison yet.
> > > > > >
> > > > > > feature wise, pyx support erl=2, mc/s. it run faster
> > > > > > (not sure how much)
> > > > > > on better HW like 10G.
> > > > > >
> > > > > > ming
> > > > > >
> > > > > >
> > > > > > On Sat, 2006-02-25 at 06:09 -0800, Rik Herrin wrote:
> > > > > > > Hi,
> > > > > > > I was wondering if anyone had made a comparison
> > > > > > > between the IET target in comparison with
> > > > > > WinTarget
> > > > > > > and PyX? I was thinking in terms of features,
> > > > > > > performance, RFC compatibility, etc. Thanks for
> > > > > > your help.
> > > > > > >
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