User Manual

SCSI Commands Reference Manual, Rev. J 375
www.seagate.com Parameters for direct access devices
5.2.24.3 Utilization Usage Rate Based on Date and Time
The Utilization Rate Based on Date and Time log parameter for the Utilization log page has the format defined in table208. If the
current date and time has not been initialized by a SET TIMESTAMP command (see
SPC-5), then the Utilization Rate Based on Date
and Time log parameter shall not be returned in the Utilization log page (see table 355).
PARAMETER CODE field
The PARAMETER CODE field is described in 5.2.2.2.2 and shall be set to the value shown in table 357 for the Utilization Rate Based on Date and
Time log parameter.
PARAMETER LENGTH field
The PARAMETER LENGTH field is described in 5.2.2.2.2 and shall be set to the value shown in table 357 for the Utilization Rate Based on Date
and Time log parameter.
DATE AND TIME BASED UTILIZATION RATE field
The DATE AND TIME BASED UTILIZATION RATE field (see table 359) contains an estimate of the rate at which device wear factors (e.g., damage
to the recording medium) associated with the logical unit have been used during the interval that begins at the date and time of manufacture
and ends at the timestamp that is reported by a REPORT TIMESTAMP command (i.e., the current value of a device clock) (see SPC-5).
Table 357 Utilization Rate Based on Date and Time log parameter format
Bit
Byte
7 6 5 4 3 2 1 0
0 (MSB)
PARAMETER CODE (0001h)
1 (LSB)
2 PARAMETER CONTROL BYTE – bounded data counter log parameter (see 5.2.2.2.2.2)
3 PARAMETER LENGTH (02h)
4 DATE AND TIME BASED UTILIZATION RATE
5 Reserved
Table 358 DATE AND TIME BASED UTILIZATION RATE field
Code Description
0 to 99
The Workload Utilization usage rate has been less than (i.e., 0% to 99% of) the designed usage rate
during the interval that begins at the date and time of manufacture and ends at the timestamp.
100
The Workload Utilization usage rate has been the exact designed usage rate during the interval
that begins at the date and time of manufacture and ends at the timestamp.
101 to 254
The Workload Utilization usage rate has been greater than (i.e., 101% to 254% of) the designed
usage rate during the interval that begins at the date and time of manufacture and ends at the
timestamp.
255
The Workload Utilization usage rate has been greater than 254% of designed usage rate during the
interval that begins at the date and time of manufacture and ends at the timestamp.