Hp XP P9500 Storage User Manual Page 24
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NOTE: Doing this calculation for multiple volumes can result in inaccuracies. Perform the
calculation for each volume seperately, then total the bitmap areas. The following examples
show correct and incorrect calculations. Two volumes are used: one of 10,017 cylinders and
another of 32,760 cylinders
Correct calculation
ceil ((10,017 x 15) / 122,752) = 2 ceil ((32,760 x 15) / 122,752)
= 5 Total: 7
Incorrect calculation
10,017 + 32,760 = 42,777 cylinders ceil ((42,777 x 15) / 122,752)
= 6
NOTE: If using LUSE volumes, add 1 to the required number of bitmap areas calculated in the
formula above.
To calculate the maximum number of pairs
The maximum number of pairs is determined by the following:
• The number of bitmap areas required for Continuous Access Journal (calculated above).
• The total number of bitmap areas in the storage system, which is 65,536.
Bitmap areas reside in an additional shared memory, which is required for Continuous Access
Journal.
◦ Bitmap areas are used not only by Continuous Access Journal, but also by Continuous
Access Journal Z, Continuous Access Synchronous, Continuous Access Synchronous Z,
and External Storage Access Manager. Therefore, the number of bitmap areas used by
these other program products (if any) must be subtracted from 65,536, with the difference
used to calculate the maximum number of pairs for Continuous Access Journal.
◦ If Continuous Access Synchronous and Continuous Access Journal share the same volume,
you must use the total number of bitmap areas for both pairs regardless of whether the
shared volume is main or remote.
• The maximum number of pairs supported per storage system, which is 32,768. If RAID Manager
is used, it is 32,767.
Calculate the maximum number of pairs using the following formula.
Maximum number of pairs = floor( Number of bitmap areas / required
number of bitmap areas )
If the calculated maximum number of pairs exceeds the total number of LDEVs, and the total LDEVs
are less than 32,768, then the total LDEV number is the maximum number of pairs that can be
created.
Maximum initial copy operations and priorities
During configuration, you specify the maximum number of initial copies that can be run at one
time. The system allows up to 128 initial copies to run concurrently. You do this for performance
reasons (the more initial copies running concurrently, the slower the performance).
You will also specify the priority for each initial copy during the create pair operation. Priority is
used when you are creating multiple initial copies during an operation. Creating multiple initial
copies in one operation is possible because you can specify multiple P-VOLs and S-VOLs in the
Paircreate dialog box. The pair with priority 1 runs first, and so on up to 256.
24 Planning volumes, P9500 systems
- User Guide 1
- Contents 3
- 4 Contents 4
- Contents 5 5
- 6 Contents 6
- Contents 7 7
- P9500 storage systems 10
- Pair volumes 11
- Journal volumes 11
- Journals 11
- Reference Information 12
- Differential data management 13
- S-VOL write option 14
- Pair status 14
- System requirements 15
- Plan and design workflow 18
- Write-workload 19
- Sizing journal volumes 20
- Planning journals 20
- RAID group configuration 21
- Planning journal volumes 22
- Planning pair volumes 22
- Planning pair volumes 23 23
- Host failover software 25
- Planning for previous models 29
- System option modes 31
- 4 Planning the data path 34
- Calculating bandwidth 35
- 36 Planning the data path 36
- Sizing bandwidth 37 37
- 38 Planning the data path 38
- Packet loss 39
- Example configuration 40
- Port types 40
- Additional switches 41
- 42 Planning the data path 42
- 5 Configuration operations 44
- 46 Configuration operations 46
- 48 Configuration operations 48
- 50 Configuration operations 50
- 52 Configuration operations 52
- 6 Pair operations 54
- Creating the initial copy 55 55
- 56 Pair operations 56
- Creating the initial copy 57 57
- Splitting pairs 58
- Splitting mirrors 59
- Creating point-in-time copies 60
- Resynchronizing pairs 60
- Resynchronizing pairs 61 61
- Resynchronizing mirrors 62
- Deleting pairs 62
- Deleting pairs 63 63
- Deleting pairs in a mirror 64
- Deleting pairs in a mirror 65 65
- 7 Monitoring the system 66
- PSUS types and behaviors 69
- PSUE types and behaviors 71
- Selecting data to be graphed 74
- Manipulating graph, save data 76
- History of pair operations 79
- 8 Maintaining the system 80
- ◦ Initial 81
- ◦ Stopped 81
- ◦ Hold(Failure) 81
- 82 Maintaining the system 82
- 84 Maintaining the system 84
- Logical path maintenance 86
- Deleting logical paths 87
- When power stops unexpectedly 88
- 90 Maintaining the system 90
- General recovery procedures 91
- Cnt Ac-J secondary site: HOLD 100
- 10 Troubleshooting 103
- Troubleshooting logical paths 105
- B9E2, B9E4, D004 109
- B9E4, D004 112
- Miscellaneous troubleshooting 121
- 122 Troubleshooting 122
- Contacting HP 123
- Related information 123
- Typographic conventions 124
- Overview 126
- Failure recovery 127
- B Sharing volumes 133
- Cache Residency 135
- Data Retention 135
- Thin Provisioning 136
- LUN Expansion 137
- LUN Manager 137
- Fast Snap and Snapshot 137
- 138 Sharing volumes 138
- Virtual LUN 139
- Auto LUN 140
- 3DC cascade configuration 141
- Delta resync configuration 144
- ◦ Use the same mirror ID 146
- Problems that can occur 148
- ◦ Assign it to other mirrors 149
- ◦ Use it with RAID Manager 149
- 2 Data center configuration 151
- Pair status and data currency 156
- E GUI reference 157
- Journal Detail window 159
- Pair Operation window 165
- Paircreate dialog box 169
- Pairsplit-r dialog box 171
- Pairresync dialog box 172
- Pairsplit-S dialog box 173
- Change Pair Option dialog box 174
- Display Filter dialog box 174
- DKC Operation window 175
- Remote systems information 176
- Logical Path Information 177
- DKC Status dialog box 179
- Add DKC dialog box 180
- DKC Option dialog box 181
- Usage Monitor window 182
- History window 183
- Operations in History window 184
- History window notes 185
- Optional Operation window 186
- Glossary 188
- 190 Index 190
- 192 Index 192
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