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Re: [Qemu-ppc] Bug with REPORT LUNS in IBM VSCSI


From: Paolo Bonzini
Subject: Re: [Qemu-ppc] Bug with REPORT LUNS in IBM VSCSI
Date: Thu, 03 Oct 2013 10:05:38 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130923 Thunderbird/17.0.9

Il 02/10/2013 18:05, Nathan Whitehorn ha scritto:
> 
>> Both Linux and Windows scan each channel separately.  Linux, in
>> addition, does not expect REPORT LUNS to use the logical unit addressing
>> method in the returned list of LUNs.  The driver converts the
>> channel/target/LUN tuple to that addressing method when it builds the
>> SRP commands.
> 
> Right, I see that. And this is an approach that works, but is really
> really ugly since it is assumes a fixed range of possible LUNs. It also
> relies on some kind of inference about which LUNs actually exist since
> SRP has no mechanism to report a non-existant "target" back to the host
> (since there is only one target, it can't have non-existant targets, so
> there is no mechanism for this).

I can certainly change REPORT LUNS to report all subtargets, but I need
to be careful and not break Linux...

Paolo



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