It appears that the raw interface of the iSCSI target will reject a
Prevent Allow Medium Removal (1Eh) command with:
Sense Key: Illegal Request (0x05)
Additional Sense Code+Qualifier: Invalid Command Operation Code
(0x2000)
My guess is that this happens because the following appears as the
0x1E line in raw_table[] in cmd/iscsi/iscsitgtd/t10_raw_if.c:
{ spc_unsupported, NULL, NULL, NULL },
Is there a compelling reason why this should not be replaced with code
to pass the command through to the raw device in th same manner as for
the Start/Stop Unit (1Bh) command?
The Prevent Allow Medium Removal (1Eh) command is used by both
Multi-Media Commands (MMC-6) and SCSI Media Changer Commands (SMC-3).
It used to be in SCSI Primary Commands (SPC-4). This command has
fairly wide usage.
On a similar note, is there a compelling reason why the whole of the
SCSI Media Changer Commands set should not receive similar treatment?
Here is the list from SMC-3:
A6h Exchange Medium (12 bytes)
07h Initialize Element Status (6 bytes)
37h Initialize Element Status within Range (10 bytes)
A5h Move Medium (12 bytes)
1Bh Open/Close Import/Export Element (6 bytes) *
2Bh Position to Element (10 bytes)
1Eh Prevent Allow Medium Removal (10 bytes)
8Ch Read Attribute (16 bytes)
B8h Read Element Status (12 bytes)
A3h Request Data Transfer Element Inquiry (12 bytes) *
44h Report Volume Types Supported (10 bytes)
B5h Request Volume Element Address (12 bytes)
B6h Send Volume Tag (12 bytes)
8Dh Write Attribute (16 bytes)
Note that the two commands marked with asterisks (1Bh, A3h) already
have active entries in raw_table[].
I'm still fairly new to OpenSolaris. What is the procedure to have
these changes considered? Is raising a bug report sufficient? Or is
something more complex required?
Support for the Prevent Allow Medium Removal (1Eh) command should be a
trivial modification and I am in a position to test that myself.
The larger change to support the full SCSI Media Changer Commands set
might need a little more thought to ensure that it doesn't conflict
with the two existing command implementations. I have access to some
media changers which might be suitable for testing this.
Any comments?
Regards
--
John Connett
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