Hp XP P9500 Storage User Manual Page 27
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S-VOLs in chronological order (older data are restored earlier). This ensures that the update sequence
is maintained.
Note the following when planning for multiple systems:
• Remote Web Console is required at the primary and secondary sites.
• RAID Manager is required on the host at the primary and secondary sites.
• Journal data is updated in the secondary system based on the time stamp issued from RAID
Manager and the sequence number issued by the host with write requests to the primary
system. Time and sequence information remain with the data as it moves to the master and
restore journals and then to the secondary volume.
• With RAID Manager consistency groups, when a pair is split from the S-VOL side (P-VOL status
= PAIR), each storage system copies the latest data from the P-VOLs to the S-VOLs. P-VOL time
stamps might differ by storage system, depending on when they were updated.
• Disaster recovery can be performed with multiple storage systems, including those with Cnt
Ac-J and Cnt Ac-J Z journals, using RAID Manager. See “Switching host operations to the
secondary site ” (page 92) for information
• An error in one journal can cause suspension of all journals. See “Suspension among journals
” (page 121) for more information.
• Time stamps issued by RAID Manager and the mainframe host are different. The time stamps
issued by the mainframe host become invalid when the Cnt Ac-J Z journal is included in a
RAID Manager consistency group.
• Restoring data to the secondary system is performed when the time stamp of the copied journal
is updated. The recommended interval between time stamps is one second.
Consider the following before setting the interval:
◦ I/O response time slows when time stamps are updating among multiple storage systems.
If you shorten the interval, more time stamps are issued, resulting in an I/O response time
that is slower yet.
◦ If the interval is lengthened, the amount of time that journal data can accumulate increases,
which results in an increased amount of data to be copied.
◦ None of the above is true during the initial copy or resynchronization. During these
operations, lengthening the interval between time stamps does not result in more
accumulated journal data, because data restoring takes place regardless of time stamp.
• The recommended method for executing RAID Manager commands is the in-band (host-based)
method. This prevents I/O response from deteriorating, which may occur with the out-of-band
(LAN-based) method.
• Do not register a Cnt Ac-J Z journal in an EXCTG if it is included in a RAID Manager consistency
group. A journal is automatically released from the EXCTG when the RAID Manager pair
resynchronization operation is performed.
• In a RAID Manager consistency group containing both Cnt Ac-J and Cnt Ac-J Z journals, data
consistency is maintained in a Cnt Ac-J system when its storage system’s microcode is changed
to a version previous to 70-03-0x. However, you cannot lower the microcode for the Cnt Ac-J
Z storage system.
• It is not possible to register a journal to multiple RAID Manager consistency groups.
Multiple journals per RAID Manager consistency group
Normally, only one journal can be registered in a RAID Manager consistency group. With multiple
P9500 systems, however, up to four journals, including Cnt Ac-J Z and Cnt Ac-J journals, can be
Planning Cnt Ac-J in multiple P9500s using a consistency group 27
- 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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