User Manual

SCSI Commands Reference Manual, Rev. J 299
www.seagate.com Parameters for direct access devices
5.1.6 Rebuild Assist Input diagnostic page (42h)
Application client sends a RECEIVE DIAGNOSTIC RESULTS command to retrieve a Rebuild Assist Input diagnostic page (see table
262), which provides information about whether the rebuild assist mode (see SBC-4) is enabled or not and a device server’s
rebuild assist mode capabilities.
PAGE CODE field
The PAGE CODE field is defined in 5.1.1 and shall be set to the value defined in table 262.
PAGE LENGTH field
The PAGE LENGTH field is defined in 5.1.1.
ENABLED bit
1 An ENABLED bit set to one indicates that the rebuild assist mode is enabled.
0 An ENABLED bit set to zero indicates that the rebuild assist mode is disabled.
PHYSICAL ELEMENT LENGTH field
The PHYSICAL ELEMENT LENGTH field indicates the length in bytes of the DISABLED PHYSICAL ELEMENT MASK field and the length in bytes of
the DISABLED PHYSICAL ELEMENT field.
DISABLED PHYSICAL ELEMENT MASK field
The bits in the DISABLED PHYSICAL ELEMENT MASK field indicate the bits in the DISABLED PHYSICAL ELEMENT field that are supported. Each
bit set to one in the DISABLED PHYSICAL ELEMENT MASK field indicates that the corresponding bit in the DISABLED PHYSICAL ELEMENT field is
supported and may be set to one in a Rebuild Assist Output diagnostic page sent with a SEND DIAGNOSTIC command.
DISABLED PHYSICAL ELEMENT field
The bits in the DISABLED PHYSICAL ELEMENT field indicate the physical elements that are disabled in this logical unit. Each bit set to one indi-
cates that a physical element is disabled, and the device server shall report predicted read errors and predicted write errors for the associated
group of LBAs.
Table 262 Rebuild Assist Input diagnostic page
Bit
Byte
7 6 5 4 3 2 1 0
0 PAGE CODE (42h)
1 Reserved
2 (MSB)
PAGE LENGTH (4 + (2 x n))
3 (LSB)
4 Reserved ENABLED
5
Reserved
6
7 PHYSICAL ELEMENT LENGTH (n)
8
DISABLED PHYSICAL ELEMENT MASK...
7 + n
8 + n
DISABLED PHYSICAL ELEMENT...
7 + (2 x n)