User's Guide
Table Of Contents
- SCSI Command Support
- SCSI Commands
- Initialize Element Status - 07h
- Initialize Element Status With Range - E7h
- Inquiry - 12h
- Log Sense - 4Dh
- Mode Select (6) - 15h
- Mode Select (10) - 55h
- Mode Sense (6) - 1Ah
- Mode Sense (10) - 5Ah
- Mode Pages
- Move Medium – A5h
- Persistent Reserve In – 5Eh
- Persistent Reserve Out – 5Fh
- Position to Element – 2Bh
- Prevent Allow Medium Removal – 1Eh
- Read Buffer – 3Ch
- Read Element Status – B8h
- Release Element (6) – 17h
- Release Element (10) – 57h
- Report LUNS – A0h
- Request Sense – 03h
- Request Volume Element Address - B5h
- Reserve Element (6) - 16h
- Reserve Element (10) - 56h
- Send Diagnostic - 1Dh
- Send Volume Tag - B6h
- Test Unit Ready (00h)
- Write Buffer (3Bh)
Quantum Scalar Intelligent Libraries SCSI Reference Guide Guide 49
Persistent Reserve In – 5Eh
What the Library Does With This Command
The library returns information about persistent reservation and reservation keys that are currently active.
This command is only supported if the library control path is provided by a tape drive.
Command Usage
This command is used in conjunction with PERSISTENT RESERVE OUT to manage persistent
reservations. It can be used to retrieve a list of the current reservations and the registered reservation keys.
The PERSISTENT RESERVE IN and PERSISTENT RESERVE OUT commands should not be used with
the RESERVE ELEMENT and RELEASE ELEMENT commands.
Persistent Reserve In CDB Format
The PERSISTENT RESERVE IN CDB format is shown in the following table.
Service Action – This field specifies the type of request being made as follows:
• 0h – Read all registered reservation keys.
• 1h – Read all current persistent reservations.
• 2h – Report capabilities of the supported persistent reservation features (only supported if the
command is issued to a media changer device hosted by a tape drive).
• 3h – Report full status of registration and reservation status for each registered I_T nexus (only
supported if the command is issued to a media changer device hosted by a tape drive).
Allocation Length – This field specifies the byte length allowed for returning the requested data. The
number of bytes returned is the lesser of the available data to return or the allocation length.
Table 45 PERSISTENT RESERVE IN CDB format
Bit
Byte
76543210
0Op Code (5Eh)
1 Logical Unit Number Service Action
2 Reserved
3 Reserved
4 Reserved
5 Reserved
6 Reserved
7
Allocation Length
8
9 Control