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1
The Transfer Length field specifies the length of the transfer in blocks. The size of each
block (in bytes) is specified by the current block length specified in the Mode Parameter
block descriptor.
If SILI = 0, a sequence of blocks of the currently configured block length is to be returned,
the number of blocks being indicated in the Transfer Length field.
0
No data is transferred. This is not considered an error and the current logical position will
Transfer
Length
be unchanged.
>0 The amount of data to be transferred, in bytes or blocks as specified by the Fixed field.
Note:
Event
Status
SILI error
CHECK
COND'N
Filemark
CHECK
encountered during
COND'N
a read
EOD encountered
CHECK
during a read
COND'N
EOP/M
CHECK
encountered during
COND'N
a read
If there is a sequence of blocks of this length on the tape, they are returned to
the initiator with
status.
GOOD
If a block that is shorter than the configured length is encountered before the
sequence is complete, the blocks up to that block are returned followed by all
of that block and
CHECK CONDITION
below). The current position is set after the last block that was returned.
If a block that is longer than the configured length is encountered before the
sequence is complete, the blocks up to that block are returned followed by the
configured length from the record that was too long and
status (ILI will be reported as described below). The current position is set after
the last block that was partially returned.
Transfers of 4 bytes or less are not supported.
Read Specific Status:
Key
NO
ILI and Valid bits are set. The information bytes will be set as follows:
SENSE
Variable Block Mode: The difference between the requested Transfer
Length and the actual block size. If the block size is bigger than the
Transfer Length, this will be negative (twos complement).
Fixed Block Mode: The difference between the requested number of
records and the number of whole good records transferred. If the last
record was under length, it is considered "whole good" for the
purposes of this calculation.
NO
The Mark bit is set. Logical position will be on the EOM side of the
SENSE
filemark. Additional sense is 0001h (filemark detected). The logical
position will be on the EOM side of the filemark. Residue information is
as described below.
BLANK
Additional sense is set to 0005h (EOD detected). Residue information is
CHECK
as described below.
MEDIUM
The EOM bit is set. Additional sense is set to 0002h (EOP/M detected).
ERROR
Residue information is as described below.
status (ILI will be reported as described
CHECK CONDITION
Notes
Commands
97
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