User Manual

SCSI Commands Reference Manual, Rev. J 301
www.seagate.com Parameters for direct access devices
ENABLED bit
1 The ENABLED bit set to one indicates that, after all fields in this diagnostic page have been validated:
a) a self-test of the physical elements in the logical unit may be performed; and
b) rebuild assist mode is enabled.
0 The ENABLE bit set to zero specifies that:
a) rebuild assist mode shall be disabled;
b) the other fields in this page shall be ignored; and
c) all physical elements shall be enabled (i.e., shall not simulate a predicted error response).
PHYSICAL ELEMENT LENGTH field
The PHYSICAL ELEMENT LENGTH field shall be set to the same value that is returned in the PHYSICAL ELEMENT LENGTH field in the Rebuild
Assist Input diagnostic page.
If the PHYSICAL ELEMENT LENGTH field is not set to the same value that is returned in the PHYSICAL ELEMENT LENGTH field in the Rebuild
Assist Input diagnostic page, then the device server shall terminate the command with CHECK CONDITION status with the sense key set to
ILLEGAL REQUEST and the additional sense code set to INVALID FIELD IN PARAMETER LIST.
DISABLED PHYSICAL ELEMENT MASK field
The device server shall ignore the DISABLED PHYSICAL ELEMENT MASK field.
DISABLED PHYSICAL ELEMENT field
Each bit in the DISABLE PHYSICAL ELEMENT field specifies a physical element that shall be disabled. A bit set to one in the DISABLE PHYSICAL
ELEMENT field specifies that the device server shall respond to read commands and write commands specifying LBAs associated with that
physical element as if the associated LBAs have predicted errors. A bit set to zero in the DISABLE PHYSICAL ELEMENT field specifies that the
device servers shall not respond to read commands and write commands specifying LBAs associated with that physical element as if the asso
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ciated LBAs do not have predicted errors. If the ENABLE bit is set to one, and the DISABLE PHYSICAL ELEMENT field specifies:
a) any bits set to one that are not supported by the logical unit;
b) all bits that are supported by the logical unit are set to one; or
c) setting to zero any bits that are set to one,
then the device server shall terminate the command with CHECK CONDITION status with the sense key set to ILLEGAL REQUEST
and the additional sense code set to INVALID FIELD IN PARAMETER LIST.