Dell PowerVault ML6000 Dell PowerVault ML6000 SCSI Reference Guide - Page 64

Prevent Allow Medium Removal – 1Eh, What the Library Does With This Command, Command Usage

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Prevent Allow Medium Removal - 1Eh What the Library Does With This Command The library will prohibit movement of media to an Import/Export element when media removal has been prevented. MOVE MEDIUM commands requesting such a move will be rejected with a Check Condition indicating Medium Removal Prevented. This command does not control locking or unlocking of a mailbox. The library automatically locks mailboxes during robotic access, and unlocks them afterwards. While media removal is prevented, importing of media can still occur. The medium removal setting does not persist across power cycles of the library. Any initiator issuing this command to allow medium removal (Prevent set to 00b) will allow medium removal for all initiators. This is done to maintain compatibility with certain bridged environment behavior (e.g., Fibre Channel to Parallel SCSI). Command Usage In conjunction with keyed access to the physical library doors, this command can be used to secure the library against unauthorized removal of media. Prevent Allow Medium Removal CDB Format The PREVENT ALLOW MEDIUM REMOVAL CDB format is shown in the following table. Table 51 PREVENT ALLOW MEDIUM REMOVAL CDB format Byte Bit 7 6 5 4 3 2 1 0 0 Op Code (1Eh) 1 Logical Unit Number 2 Reserved 3 Reserved 4 Reserved 9 Control Prevent - This field controls medium removal as follows: • 00b - Allow medium removal • 01b - Prohibit medium removal • 10b - Not supported • 11b - Not supported Reserved Prevent 54 SCSI Commands

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54
SCSI Commands
Prevent Allow Medium Removal – 1Eh
What the Library Does With This Command
The library will prohibit movement of media to an Import/Export element when media removal has been
prevented. MOVE MEDIUM commands requesting such a move will be rejected with a Check Condition
indicating Medium Removal Prevented. This command does not control locking or unlocking of a mailbox.
The library automatically locks mailboxes during robotic access, and unlocks them afterwards.
While media removal is prevented, importing of media can still occur. The medium removal setting does not
persist across power cycles of the library.
Any initiator issuing this command to allow medium removal (Prevent set to 00b) will allow medium removal
for all initiators. This is done to maintain compatibility with certain bridged environment behavior (e.g., Fibre
Channel to Parallel SCSI).
Command Usage
In conjunction with keyed access to the physical library doors, this command can be used to secure the
library against unauthorized removal of media.
Prevent Allow Medium Removal CDB Format
The PREVENT ALLOW MEDIUM REMOVAL CDB format is shown in the following table.
Prevent
– This field controls medium removal as follows:
•
00b – Allow medium removal
•
01b – Prohibit medium removal
•
10b – Not supported
•
11b – Not supported
Table 51
PREVENT ALLOW MEDIUM REMOVAL CDB format
Bit
Byte
7
6
5
4
3
2
1
0
0
Op Code (1Eh)
1
Logical Unit Number
Reserved
2
Reserved
3
Reserved
4
Reserved
Prevent
9
Control