HiSup bit in INQUIRY data

Robert Griswold rgriswold at crossroads.com
Tue Apr 9 09:16:56 PDT 2002


* From the T10 Reflector (t10 at t10.org), posted by:
* "Robert Griswold" <rgriswold at crossroads.com>
*
Ken:
 
You should also be aware that versions of Microsoft Windows (W2K code base) looks at the setting in the HiSup bit to determine if the target supports more than eight logical units.  Furhter, if the target does not set the HiSup bit, the OS will not send the REPORT_LUNS command to the device, without first setting registry entries to enable what they call Large Luns.
 
Check out thier knowledge base article Q310072. (http://support.microsoft.com/default.aspx?scid=kb;EN-US;q310072).
 
Thanks,
Bob
 
Robert Griswold
Chief Technologist
Crossroads Systems, Inc.
512-928-7272

	-----Original Message----- 
	From: Ken Craig [mailto:kcraig at istor-networks.com] 
	Sent: Mon 4/8/2002 2:15 PM 
	To: t10 at t10.org 
	Cc: 
	Subject: HiSup bit in INQUIRY data
	
	

	* From the T10 Reflector (t10 at t10.org), posted by:
	* "Ken Craig" <kcraig at istor-networks.com>
	*
	In SAM-2, Section 4.8, Logical units the second paragraph states:
	
	
	
	A SCSI Target device that supports < 256 Logical units must use the
	
	single level LUN structure defined in Table 1 and set the HiSup bit in
	
	the INQUIRY data.
	
	
	
	In SAM-2, Section 4.12, Model for dependent logical units, the second
	
	paragraph, third sentence states:
	
	
	
	A SCSI target device that includes dependent logical units must set
	
	the HiSup bit in the INQUIRY data.
	
	
	
	I interpret these two sentences to mean that the setting of the HiSup
	bit
	
	is basically mandatory.
	
	
	
	My questions is:
	
	Under what conditions would a SCSI target device not be forced to set
	
	the HiSup bit in the INQUIRY data?
	
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