Rebuild And Regenerate Parameter Data - Seagate SCSI Interface Product Manual

SCSI Interface Product Manual, Rev. J
[4] The Port Control field is defined in Table 136. If the Port Control field has a value of 01b and the target is
not a multiple port device the command shall be terminated with a Check Condition status. The sense
data shall be set to Illegal Request: Invalid Field in CDB.
Table 136: Port Control field
Value Description
00 The target transfers the data using the same port that received the command.
01 The target transfers the data using a different port than that which received the
command.
10 The target transfers the data using one port of the target's choice.
11 The target transfers the data using one or more ports of the target's choice.
[5] The Logical Block Address field specifies the starting logical block address at which the target shall write
the Xor result data on its own medium.
[6] The Rebuild Length field specifies the number of blocks to be written to the medium. It also specifies the
number of blocks that are read from each source.
[7] The Parameter List Length field specifies the length in bytes of the parameter list that shall be transferred
from the initiator to the target (see Table 137).
[8] See "Control byte," paragraph 4.2.6.
5.28.1

Rebuild and Regenerate parameter data

The Rebuild and Regenerate parameter data is described in Table 137.
Table 137: Rebuild and Regenerate parameter data
Bit 7
Byte
0 Number of Source Descriptors (x) [1]
1 Reserved
2 Source Descriptor/Pad Length (MSB) [2]
3 Source Descriptor/Pad Length (LSB) [3]
Source Descriptor(s) (if any) [3]
4
:
19
: [3]
16x – 12
Source Descriptor (last) [3]
16x + 3
16x + 4
Pad (if any) (y=length) [4]
16x+y+3
16x+y+z+4 (MSB)
16x+y+z+3
Notes.
[1] The Number of Source Descriptors field indicates the number of source descriptors in the parameter data.
[2] The Source Descriptor/Pad Length specifies the sum of the lengths in bytes of all of the source descrip-
tors and the pad.
[3] The Source Descriptors identify the source device target identifiers and starting logical block addresses
on those devices for the Regenerate or Rebuild operation. See Table 138 for the source descriptor format.
6 5
Source Descriptor (first) [3]
Intermediate Data (if any) (z=length) [5]
4 3 2 1
(LSB
(LSB)
179
0