Reducing relative port size from 31 to 16 bits

Elliott, Robert (Server Storage) elliott at hp.com
Mon Jan 26 13:08:54 PST 2004


* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert (Server Storage)" <elliott at hp.com>
*
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03-344 proposes restricting the size of the SPC-3 relative target port
identifier (VPD page 83h, identifier type 4h) from 31 bits to 16 bits.
This reduces the number of possible target ports in a target device =
from
2,147,483,647 to 65,535.

The 15 most significant bits in page 83h, identifier type 4h would be
marked obsolete.  New uses of the relative target port field would only
support 16 bits.

The relative target port field is currently used by:=20
a) VPD page 83h, identifier type 4h  (supports all 31 bits)=20
b) REPORT TARGET PORT GROUPS command target port group descriptor
parameter data (supports all 31 bits)=20
c) Protocol-Specific Port log page  (used as the parameter code; =
limited
to 16 bits and thus 65,535 target ports)=20

A relative port field (covering both target ports and initiator ports =
in
a target/initiator device) is proposed for use by:

d) 03-342 PERSISTENT RESERVE IN report full status  (could support 31
bits if needed)=20
e) 03-344 Report all target ports/initiator ports VPD page=20
f) 03-354 EXTENDED COPY target descriptors specify initiator port
feature  (which can only support 16 bits)=20

The CAP WG asked that this proposed change be mentioned on the
reflector.  Any objections?=20

--=20
Rob Elliott, elliott at hp.com=20
Hewlett-Packard Industry Standard Server Storage Advanced Technology=20
 <https://ecardfile.com/id/RobElliott>
https://ecardfile.com/id/RobElliott=20




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 Reducing relative port size from 31 to 16 bits 03-344 proposes restricting the size = of the SPC-3 relative target port identifier (VPD page 83h, identifier = type 4h) from 31 bits to 16 bits.  This reduces the number of = possible target ports in a target device from 2,147,483,647 to = 65,535. The 15 most significant bits in page = 83h, identifier type 4h would be marked obsolete.  New uses of the = relative target port field would only support 16 bits. The relative target port field is = currently used by: 
a) VPD page 83h, identifier type = 4h  (supports all 31 bits) 
b) REPORT TARGET PORT GROUPS command = target port group descriptor parameter data (supports all 31 = bits) 
c) Protocol-Specific Port log = page  (used as the parameter code; limited to 16 bits and thus = 65,535 target ports) A relative port field (covering both = target ports and initiator ports in a target/initiator device) is = proposed for use by: d) 03-342 PERSISTENT RESERVE IN report = full status  (could support 31 bits if needed) 
e) 03-344 Report all target = ports/initiator ports VPD page 
f) 03-354 EXTENDED COPY target = descriptors specify initiator port feature  (which can only = support 16 bits) The CAP WG asked that this proposed = change be mentioned on the reflector.  Any objections? -- 
Rob Elliott, elliott at hp.com 
Hewlett-Packard Industry Standard = Server Storage Advanced Technology 
https://ecardfile.com/id/RobElliott 


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