Seagate 77767496 Manual De Usuario
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
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.
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.
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.
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
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