SSC-3: Discussion related to Letter Ballot SYM-019-a
Kevin D Butt
kdbutt at us.ibm.com
Thu Jun 19 12:31:36 PDT 2008
Formatted message: <A HREF="r0806190_f.htm">HTML-formatted message</A>
The 18.104.22.168 Keyless copy section should identify How an application
client determines that a Logical Unit has the capability to act as a KCSLU
or a KCDLU
There is no bit anywhere that indicates the support for acting as a KCSLU
or KCDLU. In reality, it is if the LU supports the EXTERNAL encryption
mode or the RAW decryption mode. So the request here should be reworded
to say how does an application client determine which settings of
"ENCRYPTION MODE" and "DECRYPTION MODE" fields are supported.
Looking at the section describing each of these fields, there is no text
describing a CC returned for RAW or EXTERNAL if they are not supported.
The standard is silent. This is also the case for DISABLE. Obviously the
standard does not explicitly indicate anywhere that these modes are
What should we do?
Option 1: Add text under the description of these fields stating that if
EXTERNAL or RAW mode is selected and it is not supported then CC. This
would change the standard to explicitly state that these options are
Option 2: Add text somewhere to mandate support for these modes. I
suspect this option is not desired.
I think that we must do either option 1 or option 2. The standard needs
to be clear if these are optional or not.
If we go done the path that these are explicitly stated as optional, then
this letter ballot comment leads to the question, "How do we report
support for different values in these two fields?" This is not just a
question of Keyless copy but also of MIXED decryption mode. There is an
implication that ENCRYPT and DECRYPT are supported as well as DISABLE. I
am not sure that is correct. There could be a device that only supportes
one or the other or some combinations.
Kevin D. Butt
SCSI & Fibre Channel Architect, Tape Firmware
MS 6TYA, 9000 S. Rita Rd., Tucson, AZ 85744
Tel: 520-799-2869 / 520-799-5280
Fax: 520-799-2723 (T/L:321)
Email address: kdbutt at us.ibm.com
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