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12 Managing resident cache
This topic provides instructions for using Cache Residency software to manage resident cache.
Cache Residency rules, restrictions, and guidelines
Rules
• Cache Residency must be enabled on Remote Web Console.
• Administrator or Cache Residency write access to the Remote Web Console software is required
to perform Cache Residency operations. Users without write access can view Cache Residency
information for the connected storage system but cannot set or change options.
• Do not attempt to allocate Cache Residency cache beyond the allocated capacity.
• Do not apply Cache Residency settings to volumes reserved for Auto LUN V2.
• Do not attempt to allocate Cache Residency cache redundantly over the cache area that is
already allocated to an LDEV.
• Do not apply or refer to Cache Residency settings to volumes from the host and Remote Web
Console at the same time. You can apply the settings from the host if you use Cache Manager.
• If you specify the Cache Residency setting on the volume during quick formatting, do not use
the prestaging function. If you want to use the prestaging function after the quick formatting
processing completes, release the setting and then specify the Cache Residency setting again,
with the prestaging setting enabled this time. For information about quick formatting, see the
HP XP P9000 Provisioning for Open Systems User Guide or the HP XP P9000 Provisioning
for Mainframe Systems User Guide.
• Do not perform the Business Copy quick restore operation or the Auto LUN V2 operation on
a Cache Residency volume. Also, do not specify the Cache Residency setting on the volume
on which the Business Copy quick restore or Auto LUN V2 operation is performed. These
operations swap the internal locations of the source and target volumes, which causes a loss
of data integrity. For additional information, see the HP XP P9000 Business Copy User Guide,
the HP XP P9000 Business Copy for Mainframe User Guide, and/or contact HP Technical
Support.
• To set Cache Residency for a LUSE volume, you must set Cache Residency for an LDEV that
is a component of the LUSE volume. To determine the LDEV for which you want to set Cache
Residency, you must know the exact number of LBAs in each LDEV that is a component of the
LUSE volume.
NOTE: The number of LBAs displayed on the Cache Residency window is different from the
actual number of LDEVs, and does not match the number of LBAs recognized by the host.
To identify the exact number of LBAs in a LDEV, first display the Remote Web Console main
window and search for the parity group to which the LDEV belongs according to the LDKC,
control unit (CU), and LDEV numbers. For further information about the Basic Information
Display window, see the HP XP P9000 Remote Web Console User Guide.
As shown in Figure 18 (page 76), the LUSE volume is composed of three LDEVs, for example,
00:01 (1,000 LBAs), 00:02 (1,002 LBAs), and 00:03 (1,020 LBAs). If you see from the host
and want to set Cache Residency to 500 LBAs starting from No. 1,020 LBA, you may set the
Cache Residency to 500 LBAs starting from No. 20 LBA of the 2nd LDEV because the first
LDEV size is 1,000 LBAs.
Cache Residency rules, restrictions, and guidelines 75
- 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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