Supporting Ultrium features42
HP restricted
The Encryption Status bits indicate the current encryption/decryption status of the SSC device server:
Further details
For more information about ACI, see the ACI Specification supplied by HP.
Supporting the ACI protocol
Software vendors implementing support for attached library devices will need to work closely with
the library vendor concerned. See HP’s “Ultrium Automation Cookbook” for more details.
Recommended ACI time-out values
ACI commands fall into three broad classes:
• Commands that the drive executes immediately
• Commands that the drive queues but which it can execute concurrently with auto-mode reads
and writes (in other words, streaming operation)
• Commands that the drive queues but which interrupt streaming operation.
The response time to an ACI command will depend on the type of ACI command and the activity
status of the drive at the time the command is received.
Note that the drive does not support ACI command queuing. However, under exception conditions,
command queuing may occur, say if the automation controller had timed-out the tape drive’s
response to a command and either resent the command or sent another command. In these
circumstances, the drive will not ignore the overlapped commands but will respond to every
command package it had received.
An example of when this may occur if the host issued a long SCSI
ERASE command to the drive and
the automation controller issued an
UNLOAD command, then the drive would not respond to the
UNLOAD command until the long erase had completed. If the automation controller timed out the
drive’s response to the
UNLOAD command and re-sends the command or sends another command,
then it needs to be able to handle the response to the original
UNLOAD command as well as to the
subsequent commands.
The following tables list the recommended ACI command time-outs for queued and non-queued
commands.
5 Reserved Encryption Status WORM
Value Meaning
00b The device server is currently not performing encrypting or decrypting operations.
01b The device server is currently performing encrypting or decrypting operations.
10b, 11b Reserved.
76 5 4 32 1 0
