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Re: IET, WinTarget, and PyX Comparison: msg#00172

Subject: Re: IET, WinTarget, and PyX Comparison
PyX was aquired by SBE.

nickb@xxxxxxxx

On Sun, 26 Feb 2006, Ming Zhang wrote:

> I believe Nicholas will happy to answer this question for you.
> 
> Thanks!
> 
> Ming
> 
> 
> 
> 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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