User Manual

SCSI Commands Reference Manual, Rev. J 498
www.seagate.com Parameters for direct access devices
LBPWS bit
1 A logical block provisioning write same (LBPWS) bit set to one indicates that the device server supports the use of the WRITE SAME (16)
command (see 3.74) to unmap LBAs.
0 An LBPWS bit set to zero indicates that the device server does not support the use of the WRITE SAME (16) command to unmap LBAs.
LBPWS10 bit
1 A logical block provisioning write same 10 (LBPWS10) bit set to one indicates that the device server supports the use of the WRITE SAME
(10) command (see 3.73) to unmap LBAs.
0 An LBPWS10 bit set to zero indicates that the device server does not support the use of the WRITE SAME (10) command to unmap LBAs.
LBPRZ field
The logical block provisioning read zeros (LBPRZ) field is described in table 468.
ANC_SUP bit
1 An anchor supported (ANC_SUP) bit set to one indicates that the device server supports anchored LBAs (see SBC-4).
0 An ANC_SUP bit set to zero indicates that the device server does not support anchored LBAs.
DP bit
1 A descriptor present (DP) bit set to one indicates a PROVISIONING GROUP DESCRIPTOR field is present.
0 A DP bit set to zero indicates a PROVISIONING GROUP DESCRIPTOR field is not present.
MINIMUM PERCENTAGE field
A MINIMUM PERCENTAGE field set to zero indicates that the logical unit does report a minimum percentage of resources required by the
device. A MINIMUM PERCENTAGE field set to a non-zero indicates the minimum percentage of resources required by the device server as
described in
table 469. This value indicates the point where a device server may begin device initiated advanced background operations.
Table 468 LBPRZ field
Code Description
000b
The logical block data represented by unmapped LBAs is vendor specific
xx1b
The logical block data represented by unmapped LBAs is set to zeros
010b
The logical block data represented by unmapped LBAs is set to the provisioning initialization pattern
All others
Reserved
Table 469 MINIMUM PERCENTAGE field
Code Description
0
The logical unit does not report a minimum percentage of resources required
1 to 30
(i.e., 01h to 1Eh
1% to 30% of the total allocation resources
All others
Reserved