Logical unit groups and optional target reset
Andrew Hisgen
Andrew.Hisgen at Eng.Sun.Com
Tue Jan 2 11:47:43 PST 2001
* From the T10 Reflector (t10 at t10.org), posted by:
* Andrew Hisgen <Andrew.Hisgen at eng.sun.com>
*
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> From: Charles Monia <cmonia at NishanSystems.com>
> To: "Elliott, Robert" <Robert.Elliott at COMPAQ.com>, "'t10 at t10.org'"
<t10 at t10.org>
> Subject: RE: Logical unit groups and optional target reset
> Date: Fri, 29 Dec 2000 17:27:55 -0800
> MIME-Version: 1.0
> X-Message-Number: 1499
>
> * From the T10 Reflector (t10 at t10.org), posted by:
> * Charles Monia <cmonia at NishanSystems.com>
> *
> Hi Rob:
>
> See my remarks below.
>
> > -----Original Message-----
> > From: Elliott, Robert [mailto:Robert.Elliott at COMPAQ.com]
> > Sent: Friday, December 29, 2000 2:11 PM
> > To: 't10 at t10.org'
> > Subject: RE: Logical unit groups and optional target reset
> >
> >
>
> <material deleted>
>
> > > The other issue is whether mechanisms, such as terget reset,
> > > are appropriate for a given transport. In my view, the only
> > > immutable requirement is to preserve the transport-independant
> > > part of the semantics. The definition of transport-specific
> > > side effects is best handled in the appropriate transport
> > > specification.
> >
> > The transport-independent parts are a major part of the
> > problem. Tasks are aborted, mode pages are reset, etc.
> > unexpectedly. Based on the rule from 99-245r9, devices
> > offering Access Controls can be set up to behave better.
> >
>
> For a shared device, doesn't an LU reset have similar adverse side effects
> on other initiators? This still leaves me wondering whether or not it would
> be better to restrict the operation altogether.
We need it to have those side-effects, when the device is wedged.
Yes, target reset is a powerful hammer, but we need it to unwedge
the device. The fact that multiple initiators are affected is
kind of beside the point when the device is wedged anyway.
Thanks,
--Andrew Hisgen
Solaris Products Group,
Sun Microsystems Inc
>
> Charles
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