SPC-1, SPC-2 and SPC-3 content question
Elliott, Robert (Server Storage)
elliott at hp.com
Tue Oct 12 10:06:31 PDT 2004
* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert (Server Storage)" <elliott at hp.com>
*
> * From the T10 Reflector (t10 at t10.org), posted by:
> * Brian Auld <bauld at lefthandnetworks.com>
> *
> Is this an accurate depiction of inquiry page code support (serial
> number vs. device identification), as well as reservation support
> (regular vs. persistent) in SPC1, SPC2 and SPC3? The
> "mandatory/optional" designation indicates that I found it in the spec
> with no indication of whether is was a mandatory or optional item.
>
> Can I get some feedback as to whether this is more the less accurate,
> and if some of these are, in fact, "optional" or "mandatory".
>
> ...
>
> Reservation support:
>
> |Reserve/Release |Persistent Reservations |
>------+-------------------+------------------------+
>SPC-1 |mandatory/optional?|mandatory/optional? |
>------+-------------------+------------------------+
>SPC-2 |mandatory/optional?|mandatory/optional? |
>------+-------------------+------------------------+
>SPC-3 |obsolete |mandatory/optional? |
>------+-------------------+------------------------+
>
The standard defining the peripheral device type (reported in
the standard INQUIRY data) determines whether the commands are
mandatory or optional for that peripheral device type. SPC is
just a pool from which the command set standards may select
common commands (with a few marked mandatory for all peripheral
device types).
I think the algorithm behind table 42 (spc3r21) is:
M = mandatory for all peripheral device types
O = optional for all peripheral device types
C = see the command set standard for the requirement for the
peripheral device type in question (could be mandatory
for some, optional for others)
For direct-access block devices (type 00h):
* SBC-1
RESERVE (10)/RELEASE (10) mandatory
RESERVE (6)/RELEASE (6) optional
PERSISTENT RESERVE IN/OUT optional
* SBC-2
RESERVE/RELEASE obsolete
PERSISTENT RESERVE IN/OUT optional
For sequential devices (type 01h):
* SSC-1
RESERVE/RELEASE mandatory
PERSISTENT RESERVE IN/OUT optional
* SSC-2
RESERVE/RELEASE not mentioned (obsolete)
PERSISTENT RESERVE IN/OUT mandatory
--
Rob Elliott, elliott at hp.com
Hewlett-Packard Industry Standard Server Storage Advanced Technology
https://ecardfile.com/id/RobElliott
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