Re: Fwd: Re: [Scst-devel] linuxcon 2010...

[Vladislav Bolkhovitin]

James Bottomley, on 08/18/2010 12:30 AM wrote:
> > 1. What don't you like in the transition path for users from STGT to
> > SCST, which I proposed:
> >
> >    - The only people which would be affected by replacing of STGT by SCST
> > would be users of ibmvstgt. Other STGT users would not notice it at all.
> > Thus, we should update ibmvstgt for SCST. If ibmvstgt updated for SCST,
> > the update for its users would be just writing of a simple scstadmin's
> > config file.
> >
> >    - STGT doesn't have backend drivers, which SCST doesn't have, so
> > there's nothing to worry here. At max, AIO support should be added to
> > fileio_tgt.
> >
> >    - STGT user space targets can use SCST backend via scst_local module.
> > Scst_local module is ready and work very well.
> >
> > The result would be very clear without any obsolete mess.
>
> So does that get us up to being a drop in replacement?  I think you're
> saying that even with all of this, at least the VSCSI part will need
> updating, so the answer seems to be "no".

Sorry, I can't understand, "no" for which? For the whole transition 
path, or just until there is a patch for ibmvstgt to become ibmvscst?

> > 4. Have you changed your opinion that a driver level multipath is
> > forbidden in Linux and now you think that an iSCSI target with MC/S
> > support is acceptable?
>
> no; I still think MCS is a pointless duplication of multipath that only
> works for iSCSI.

Then, does it mean that similarly as it was with open-iscsi, which had 
to remove MC/S support to be able to be accepted into the mainline, an 
iSCSI target can't go into mainline if it has MC/S?

Thanks for answers,
Vlad
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