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Bind mode has the following advantages:
• The accessibility of read data is the same as Cache Residency priority mode.
• Write operations do not have to wait for available cache segments.
• There is no back-end contention caused by destaging data.
In Bind Mode, the total capacity of cache required is:
standard cache + Cache Residency cache
For more information about calculating case size for bind mode, see “Estimating cache size”
(page 69).
The next table specifies the cache requirements for bind mode operations:
Table 4 Bind mode cache requirements
Cache Residency Cache
Requirement
Capacity SpecificationsRAID Level or Volume
Type
System Type
3 times the space required for
user data: 1 slot = 3 × 264
Slot capacity: 264 KB
Cache segment capacity: 16.5
KB
RAID 5 (3390) or RAID
6
OPEN Systems
KB = 792 KB = 48 cache
segments
Cache segments needed per
slot: 48 (slot capacity / cache
segment capacity)
2 times the space required for
user data: 1 slot = 2 × 264
Slot capacity: 264 KB
Cache segment capacity: 16.5
KB
RAID 1, or external
volumes
KB = 528 KB = 32 cache
segments
Cache segments needed per
slot: 32 (slot capacity / cache
segment capacity)
3 times the space required for
user data: 1 slot = 3 × 66 KB
Slot capacity: 66 KB
Cache segment capacity: 16.5
KB
RAID 5 mainframe or
RAID 6
Mainframe (for example,
3390-3, 3390-9)
= 198 KB = 12 cache
segments
Cache segments needed per
slot: 12 (slot capacity / cache
segment capacity)
Note: Even though a mainframe
track is 56 KB, because cache
is divided into 16.5 KB
segments, it requires 4
segments.
2 times the space required for
user data: 1 slot = 2 × 66 KB
Slot capacity: 66 KB
Cache segment capacity: 16.5
KB
RAID 1 mainframe, or
external volumes
= 132 KB = 8 cache
segments
Cache segments needed per
slot: 8 (slot capacity / cache
segment capacity)
Cache Residency bind data that has write attributes is normally not destaged. However, the data
is destaged in the following cases:
• During cache blockage that is caused by certain maintenance operations (for example, cache
upgrades) or by cache failure.
• If the storage system is powered off.
• If the volume is deleted from Cache Residency bind mode.
Bind mode 15
- Mainframe Systems User Guide 1
- Contents 3
- 4 Contents 4
- Contents 5 5
- 6 Contents 6
- Contents 7 7
- 1 Performance overview 8
- Cache Residency overview 9
- 10 Performance overview 10
- Placing data in cache 13
- Prestaging specific data 13
- Priority mode 14
- Bind mode 14
- Using Performance Control 18
- Using Performance Control 19 19
- WWN monitoring data 20
- Microprogram replacement 20
- 4 Monitoring WWNs 23
- Editing the WWN nickname 24
- Connecting WWNs to ports 24
- 5 Monitoring CUs 26
- 6 Monitoring operation 28
- Stopping monitoring 29 29
- Viewing statistics 30
- 8 Working with graphs 32
- Usage rates of MPs 34
- Usage rate of cache memory 35
- Write pending statistics 35
- Access paths usage statistics 36
- Throughput of storage system 37
- Size of data transferred 38
- Response times 39
- Cache hit rates 40
- Storing period 41
- Back-end performance 42
- Hard disk drive access rates 43
- 9 Changing display of graphs 45
- Deleting graph panel 46
- Port tab operations 53
- Analyzing traffic statistics 54
- Port tab operations 55 55
- Setting a threshold 56
- WWN tab operations 57
- WWN tab operations 61 61
- WWN tab operations 63 63
- Grouping host bus adapters 65
- Renaming an PFC group 67
- Deleting an PFC group 68
- 11 Estimating cache size 69
- 70 Estimating cache size 70
- 72 Estimating cache size 72
- Cache Residency cache areas 73
- 12 Managing resident cache 75
- 76 Managing resident cache 76
- Launching Cache Residency 77
- 78 Managing resident cache 78
- 80 Managing resident cache 80
- 13 Troubleshooting 82
- Contacting HP 83
- Related information 83
- Typographic conventions 84
- Typographic conventions 85 85
- A Export Tool 86
- Installing the Export Tool 87 87
- Using the Export Tool 88
- Using the Export Tool 89 89
- 90 Export Tool 90
- Preparing a batch file 91
- Running the Export Tool 92
- Processing time 93
- Termination code 93
- Log files 94
- Error handling 94
- Export Tool command reference 95
- Subcommand list 96
- outoption compressapply 97
- Operands 102
- Examples 108
- Short-range 109
- Description 111
- ◦ Default: 20 minutes 116
- ◦ Minimum: 1 minute 116
- Exported files 117
- Port statistics 124
- Volumes (LU) statistics 125
- MP blades 126
- Monitored CUs tab 138
- Monitored WWNs tab 138
- Edit Monitoring Switch wizard 139
- Monitor Performance window 140
- Data Range 141
- Time Range 141
- Performance Objects 141
- Selected Objects table 142
- Object field is blank 145
- Available Objects table 147
- Edit CU Monitor Mode wizard 148
- Unmonitored CUs table 149
- Confirm window 150
- View CU Matrix window 152
- Available Parity Groups table 154
- Parity Group Properties table 154
- Edit WWN wizard 155
- Edit WWN Monitor Mode wizard 156
- Unmonitored WWNs table 157
- Delete Unused WWNs window 160
- Add New Monitored WWNs wizard 160
- WWN Name 161
- Available Ports table 161
- Selected WWNs table 161
- Add to Ports wizard 163
- Monitor window 165
- Graph panel 166
- MP Properties window 167
- Edit Time Range window 168
- Setting fields 169
- Monitor Data 170
- Performance Object Selection 170
- Add Graph window 177
- Wizard buttons 185
- Navigation buttons 185
- Performance Control window 187
- Cache Residency window 195
- LDEV Information table 196
- Cache Information 197
- Operations box 198
- Multi Set dialog box 199
- Multi Release dialog box 200
- Multi-Release LDEV table 201
- Glossary 202
- 204 Index 204
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