Generate Recommended Access Order Command; Table 3-8 Generate Recommended Access Order Command - Oracle StorageTek T10000 Reference Manual

Generate Recommended Access Order Command

Generate Recommended Access Order Command
The Generate Recommended Access Order (GRAO) command generates a
recommended access order for the User Data Segments that are sent by the command
as parameter data. The GRAO command is defined by an operation code and Service
Action. The GRAO parameter list is processed before status for the command is
returned. After the GRAO command completes the Receive Recommended Access
Order (RRAO) command can be used to receive the results in the form of a
Recommended Access Order (RAO) list.

TABLE 3-8 Generate Recommended Access Order Command

Byte 7
0
1
2
3
4
thru
5
6 (MSB)
thru
9
10
11
Parameter
RAO Process: Method used to
generate RAO list
44 T10000: Interface Reference Manual
6 5
Operation Code(A4H)
Reserved
Reserved
Reserved
Parameter List Length
Value
000b = List of user data segments not reordered, estimated
locate times from current position to first logical block
001b = List of user data segments not reordered, estimated
locate times from current position to first logical block and
then from last logical block in previous user data segment to
first logical object in this user data segment.
010b = List of user data segments is reordered into the
recommended access order, estimated locate times from
current position to first logical block in the reordered list and
then from last logical block in previous user data segment to
first logical object of this user data segment.
000b = List of user data segments not reordered, estimated
locate times from beginning of partition 0 to the position to
first logical block in each user data segment.
Bit
4 3 2
Service Action (11h)
Reserved
Reserved
Control Byte
1 0
RAO Process
UDS_Type
(LSB)
August 2016