Logical unit groups and optional target reset
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.
Solaris Products Group,
Sun Microsystems Inc
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