Reference Guide

Chapter 4 SCSI Commands
Use of DLTSage WORM Tapes
DLT-S4 Interface Reference Guide 347
• Understanding the timeout value for creating the DLTSage WORM
cartridge,
• Determining if tampering of the DLTSage WORM cartridge has
occurred,
• Responding to DLTSage WORM sense data and DLTSage WORM
TapeAlerts and,
• Failure Modes and Recovery Actions
Determining if the SDLT
Drive is DLTSage WORM
Capable
1
The Sequential-Access Device Capabilities Page (0xB0) contains an
indicator that the drive is DLTSage WORM Capable. This indicator
defined as “WORM” will always be set for the DLT-S4 drive.
Determining if the Current
Cartridge is a DLTSage
WORM
1
Once a DLTSage WORM tape is created, a READ ATTRIBUTE command
for the
MEDIUM TYPE Attribute (0x0408) of MAM will return the Medium
Type as Write-Once media (0x80).
Converting an SDLT Data
Cartridge to DLTSage
WORM
1
A standard DLTtape S4 cartridge is converted to a DLTSage WORM tape
by sending a
WRITE ATTRIBUTE command to the drive that sets the
MEDIUM TYPE Attribute (0x0408) to “Write Once” (0x80). This is only
allowed for blank unformatted tapes; formatted native tapes with no data
on them; or formatted native tapes with one filemark and an EOD on
them.
Note: In order to convert a formatted tape with one filemark and an
EOD on it to a DLTSage WORM tape, the filemark and EOD
must be read into the drive’s cache. This happens
automatically at load time and if one filemark is written. If the
host or test software issues a
REWIND command after writing
the filemark, then it is the host or test software’s responsibility
to issue a
READ command to read the filemark and EOD back
into the drive’s cache.