User Manual

SCSI Commands Reference Manual, Rev. J 473
www.seagate.com Parameters for direct access devices
5.4.4 Block Device Characteristics Extension VPD page (B5h)
The Block Device Characteristics Extension VPD page (see table 446) contains parameters indicating characteristics of the logical
unit.
PERIPHERAL QUALIFIER field
The PERIPHERAL QUALIFIER field is defined in SPC-5.
PAGE CODE field, PERIPHERAL DEVICE TYPE field, and PAGE LENGTH field
The PAGE CODE field, PERIPHERAL DEVICE TYPE field, and PAGE LENGTH field are defined in SPC-5 and shall be set to the values shown in table
446 for the Block Device Characteristics Extension VPD page.
UTILIZATION TYPE field
The UTILIZATION TYPE field (see table 447) indicates the designed utilization characteristics for the direct access block device based on the
contents of the UTILIZATION A field and the UTILIZATION B field evaluated using the units indicated by the UTILIZATION UNITS field over the
time interval indicated by the UTILIZATION INTERVAL field.
Table 446 Block Device Characteristics Extension VPD page
Bit
Byte
7 6 5 4 3 2 1 0
0 PERIPHERAL QUALIFIER PERIPHERAL DEVICE TYPE
1 PAGE CODE (B5h)
2 (MSB)
PAGE LENGTH (007Ch)
3 (LSB)
4 Reserved
5 UTILIZATION TYPE
6 UTILIZATION UNITS
7 UTILIZATION INTERVAL
8 (MSB)
UTILIZATION B. . .
11 (LSB)
12 (MSB)
UTILIZATION A. . .
15 (LSB)
16
Reserved. . .
127
Table 447 UTILIZATION TYPE field
Code Definition
01h
Combined writes and reads: the UTILIZATION A field contains designed number of host
requested bytes transferred by write operations and host requested bytes transferred
by read operations. The UTILIZATION B field is reserved.
02h
Writes only: the UTILIZATION A field contains designed number of host requested bytes
transferred by write operations. The UTILIZATION B field is reserved.
03h
Separate writes and reads: the UTILIZATION A field contains designed number of host
requested bytes transferred by write operations. The UTILIZATION B field contains
designed number of host requested bytes transferred by read operations.
All others Reserved