Sun Oracle Storage Tek T10000, Справочное руководство

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Write Buffer Command
234 T10000: Interface Reference Manual • January 2011 • E20425-01
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Write Buffer Command
The Write Buffer command updates the functional microcode for the drive. The
process of updating microcode is called a download.
A change in the initiator from one Write Buffer command to another during a
download is interpreted as a new download process request and terminates
the active process. This allows another initiator to download microcode if the
first initiator goes down before completing its download request.
A successful download writes new microcode to memory and resets the tape
drive after the final Write Buffer command completes.
A failure of the writing process causes the drive to retain the current version of
the microcode.
A CRC check is performed over the entire microcode after the last command.
A Unit Attention condition is set for all initiators other than the initiator that
requested the download with the additional sense code set to Microcode Has
Been Changed.
Any buffered write data and filemarks are written on the tape before this
operation starts.
Table 177. Write Buffer Command
Byte Bit
7 6 5 4 3 2 1 0
0 Operation Code (3B)
1 Reserved Mode
2 Buffer ID
3
thru
5
(MSB)
Buffer Offset
(LSB)
6
thru
8
(MSB)
Parameter List Length
(LSB)
9 Control Byte