Seagate Fibre Channel Interface - Manual (Page 244)

230 Fibre Channel Interface Manual, Rev. D
12.13.7 Caching Parameters page (08h) for Mode Sense/Mode Select
The Caching Parameters page defines the parameters that affect the use of the cache.
Field definitions (listed alphabetically)
ABPF (Abort Prefetch)
1
With the DRA bit equal to zero (0), requests that the SCSI device abort the prefetch upon selection.
The ABPF set to 1 takes precedence over the Minimum Prefetch bytes.
0 With the DRA bit equal to zero (0), the termination of any active prefetch is dependent upon Caching Page bytes 4
through 11 and is operation and/or vendor specific.
Cache Segment Size
The requested segment size (in bytes). This standard assumes that the Cache Segment Size field is valid only when the
SIZE bit is 1.
CAP (Caching Analysis Permitted)
1
Caching analysis enabled.
0 Caching analysis disabled.
Caching analysis results are placed in the SCSI Logging Information Table (Table 136).
Table 152: Caching Parameters page (08h)
Bit
Byte
7 6 5 4 3 2 1 0
Page descriptor header
0 PS Reserved Page Code (08h)
1
Page Length (12h)
2 IC ABPF CAP DISC SIZE WCE MF RCD
3 Demand Read Retention Priority Write Retention Priority
4
(MSB)
Disable Prefetch Transfer Length
5
(LSB)
6
(MSB)
Minimum Prefetch
7
(LSB)
8
(MSB)
Maximum Prefetch
9
(LSB)
10
(MSB)
Maximum Prefetch Ceiling
11
(LSB)
12 FSW LBCSS DRA Reserved
13
Number of Cache Segments
14
(MSB)
Cache Segment Size
15
(LSB)
16
Reserved
17
(MSB)
Non-Cache Segment Size 18
19
(LSB)
Table
number
152
152
152