Hp XP P9500 Storage User Manual Page 147
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Prerequisite information for delta resync operation
You perform the delta resync operation using the Pair Resync operation. After reviewing these
prerequisites, see “Resynchronizing pairs ” (page 60).
• The delta resync P-VOL must be updated for longer than 5 minutes after the operation is
completed and pair status has changed to PAIR. However, a workaround is available that
allows you to avoid the 5-minute update requirement. See “Assigning remote command devices
” (page 148) for details.
• Required pair and volume statuses:
The Cnt Ac-S volume used as the 3DC multi-target P-VOL: PAIR◦
◦ The Cnt Ac-S S-VOL used as the delta resync P-VOL: SSWS.
Check this status after executing the RAID Manager horctakeover command
◦ The Cnt Ac-J delta resync pair: HOLD or HOLDING. If the pair status is HLDE, change to
HOLD by performing the pairresync operation.
This applies to all pairs in the journal in which the Cnt Ac-J pair for delta resync resides.
◦ The Cnt Ac-J volume used as the 3DC multi-target and the delta resync pair S-VOL and
uses two mirror IDs — one for the 3DC multi-target pair and one for the delta resync pair:
- 3DC multi-target S-VOL: PAIR, PSUS, or PSUE
- Delta resync S-VOL: HOLD.
NOTE: The Cnt Ac-J S-VOL uses two mirror IDs because of its dual use in the 3DC
multi-target and delta resync configurations. The statuses shown above are required for
the two mirrors as well as for the journal in which the Cnt Ac-J pair for delta resync resides.
• If the delta resync S-VOL has been backed up on the remote site using BC, FS, or SS, make
sure to review the information for the Delta resync Failure step on the Change Mirror Option
window (“Changing options used by mirrors ” (page 82)).
• Differential data is stored in the master journal but may not be completely present after a
failure at the primary site when the pair was being recovered (or after creating the delta resync
pair configuration).
• If data in the restore journal exceeds 80% of capacity, old journal data is automatically
deleted. This can occur when the suspended pair has not been re-synchronized for a long
time.
In this case, based on journal option settings, the entire P-VOL is copied to the S-VOL. In a
delta resync operation, processing is not performed.
• Journal data may also be destroyed in the following cases:
When you restore the Cnt Ac-S or Cnt Ac-J pair in the multi-target configuration, then also
update the delta resync pair.
◦
◦ When retry-processing occurs because of a delay of the P-VOL update.
◦ When the update of a Cnt Ac-S S-VOL is delayed.
• The Cnt Ac-J pair status in a delta resync configuration could become PSUS or PSUE if you
split the pair, or if there is a failure when copying all data from the P-VOL to the S-VOL. If you
then run the delta resync operation, all data might be copied from P-VOL to S-VOL regardless
of journal option settings.
• If the pair’s mirror is in Halting or Stopping status, the resynchronization command is rejected.
Delta resync configuration 147
- 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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