HP Surestore 28/48-Slot with DLT7000 Digital Linear Tape SCSI-2 Drive and SCSI - Page 39

NOTE SCSI Command Overview Library Control Commands Conditions Attention Condition The Attention Condition allows an initiator to inform the target that it has a message ready. The target gets this message at its convenience when it performs a Message Out. The target responds to the ATN signal at every phase transition with MESSAGE OUT, provided ATN was set before REQ was dropped. MESSAGE OUT is either received immediately or after the transition completes. Reset Condition When you see Reset Condition, the following occurred: • Power was applied • The RST (Reset) signal is asserted • The BUS DEVICE RESET message is received If the target will abort any outstanding commands and undo moves aborted. If the target is not operating in a cohesive manner (hang encountered--an unrecoverable situation), the following occurs: • A Power-on reset • A Hard Bus reset • A message on the front panel that tells you to write it down and power cycle Within five seconds of power on and within 250 milliseconds (typically under four milliseconds) after a Bus Reset, the library responds to SCSI bus selections. Chapter 1 1- 15