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14. APPENDIX G: CD-ROM Device Emulation for
Disaster Recovery
14.1. Overview
This chapter will outline the Disaster Recovery Specifications for Sony AIT drive and autoloader. While in Disaster
Recovery mode, the drive behaves as a bootable CD-ROM device. Using the DR tape image, users will be able to
do a complete restore of the system.
14.2. Creating Disaster Recovery Tape
The Disaster Recovery tape must have the CD-ROM image of the operating system written first on the tape. This
image is formatted in El Torito CD-ROM Boot Specification.
Disaster Recovery Tape can be created using Veritas BackupExec Software. Please follow instructions of Veritas
BackupExec to create the DR tape. After the tape has been created, the tape must be write-protected to be
considered DR tape.
14.3. Configuring The Drive For Disaster Recovery Operation
To enter DR mode, the tape drive needs to be configured with the following steps:
1. Turn on the DIP Switch 1 [DR Mode Enable] of the drive.
2. Insert a write-protected DR tape and wait for the drive to complete the loading sequence.
3. Observe the simultaneous flashing all LED. This is the DR standby mode. The drive will remain in this
mode for a period of 15 seconds. Powering down the drive during this 15 seconds window will trigger the
DR mode. The drive will exit the DR standby mode after 15 seconds and resume normal mode of
operation. A SCSI reset will force the drive to exit the DR standby mode and service the SCSI reset.
4. Upon power up, the drive will enter the DR mode. Observe the simultaneous flashing LEDs of TAPE
MORTION and CLEANING REQUEST. While in DR mode, a SCSI RESET will be treated as soft reset
and will not take the drive out of DR mode.
Also, the drive will enter DR mode upon receiving a Mode Select command with Page Code 0x3C.
14.4. Exiting DR Mode
Ejecting the media via the front panel button or a SCSI UNLOAD command will exit the DR mode and restore the
drive to normal operation. A SCSI Mode Select command with Page Code 0x3C and DREnable bit of zero will also
exit the drive out of DR mode. On the autoloader, the DR mode indication on the 4th line of the LCD will disappear
once the drive exits from DR mode.
14.5. Supported CD-ROM DR Command Set
14.5.1. Inquiry (12h)
5.1.1.
Peripheral Device Type = 0x05 (CD-ROM)
5.1.2.
Byte 43 = 0x24 (ASCII "$")
5.1.3.
Byte 44-48 = "DR-10"
14.5.2. Read 10 (28h)
This command shall only be supported in DR mode. Execution of this command is in effect a translation of a
LOCATE command and READ 6 (0x08) command executing in sequence.
14.5.3. Read Capacity (0x25)
This command shall only be supported in DR mode.
5.3.1.
Returned LBA (Capacity) = 0004B000h
5.3.2.
Block Length
SONY AIT-5 drive SDX-1100V series Ver.1.0
14.Appendix G: CD-ROM Device Emulation for Disaster Recovery
(~640 Mbytes)
= 00000800h
(2048 Bytes)
14-1
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