M2488 PRODUCT GUIDE
TAPE UNIT SCSI COMMANDS
April 1997
CG00000-011503 REV. A
4-153
4-4
COMMAND DISCONNECTION
After receiving any command, the controller disconnects if disconnection is not inhibited by the IDEN-
TIFY message and the controller requires device activity to complete the request.
The controller reconnects to perform parameter or data transfers or to present command completion sta-
tus as required.
Multiple disconnect and reconnect sequences may be performed for a single READ or WRITE com-
mand as space or data becomes available in the buffer.
4-5
SCSI RESET
The SCSI Reset is performed in response to a SCSI BUS RESET or a BUS DEVICE RESET Message.
The M2488 supports the SCSI hard reset alternative as follows:
•
All SCSI I/O processes are cleared; i.e., the SCSI I/O process ends with the BUS FREE phase.
•
Any back-end (tape motion or medium changer motion) operation in progress (rewind, synchronize,
erase, locate, space, unload, or write filemarks, etc.) is allowed to complete after all of the SCSI I/O
processes are cleared.
•
Buffered write data is synchronized to tape.
•
Buffered write data error is discarded.
•
All SCSI device reservations are released.
•
Power-on/Reset Unit Attention is generated.
Содержание M2488
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