SBC-2 FORMAT UNIT - possibly obsolete fields

Elliott, Robert (Server Storage) elliott at hp.com
Mon Jan 19 13:27:15 PST 2004


* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert (Server Storage)" <elliott at hp.com>
*
In SBC-2, does anyone still need these fields in the FORMAT UNIT command
or can they be made obsolete?  This would be proposed at the March T10
CAP WG meeting.

(reminder: obsolete just means "defined in previous versions of the
standard.")

INTERLEAVE (in the CDB) - specifies the interleave that is used when
performing the format operation. This allows the logical blocks to be
related in a way that may facilitate matching the transfer rate between
the application client and the peripheral. An interleave of zero
specifies
that the device server use its default interleave. An interleave of one
specifies that consecutive logical blocks be placed in contiguous 
ascending order. All other values are vendor-specific.

DISABLE SAVING PARAMETERS (DSP) (in the defect list header) - zero 
specifies that the device server shall save all the MODE SELECT savable 
parameters for all application clients to non-volatile memory during the

format operation. A DSP bit of one specifies that the device server
shall
not save the MODE SELECT savable parameters to non-volatile memory
during the format operation. Mode pages that are not reported as savable

are not affected by the DSP bit.

If DSP remains, it might need to be made clear in both SPC-3 and SBC-2
that saved pages are not necessarily saved forever, and a unit attention
indicating MODE PARAMETERS CHANGED can occur when saved mode pages are
lost.

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



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