Hp XP P9500 Storage User Manual Page 128
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• When splitting the intermediate-remote pair using flush mode, set the pair’s mirror status to
Stopped.
• When splitting the intermediate-remote pair whose S-VOL is also the delta resync S-VOL, host
I/O to the S-VOL will not be allowed even when you specify Enable for S-VOL Write in split
procedure.
• When restoring the local-intermediate pair, the intermediate-remote pair is split automatically
if its mirror status is PAIR.
• The local-intermediate pair cannot be restored when the mirror status for the intermediate-remote
pair is COPY.
• When deleting the intermediate-remote pair:
If Mirror is specified for Range, set the mirror status for either cascade pair to Stopped.◦
◦ If Volume is specified for Range, set the mirror status for the primary-intermediate pair to
Stopped, or set pair status to SUSPEND.
• Required pair and volume statuses for the delta resync operation:
Delta resync P-VOL and S-VOL: HOLD◦
◦ Cnt Ac-J P-VOL: PAIR or PSUE
◦ Cnt Ac-J S-VOL: PAIR, PSUS, PSUE
NOTE: The S-VOL uses two mirror IDs because of its dual use in the 3DC cascade 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.
• Differential data is stored in the master journal but may not be completely present after a
failure. You can avoid delta resync failure by specifying that the entire P-VOL is copied to the
delta resync S-VOL in this case. See the Delta resync Failure option in “Changing options used
by mirrors ” (page 82) for information.
• When you delete either cascading pair, the delta resync pair is also deleted.
Problems that can occur with delta resync
Journal data will not exist, and therefore the delta resync operation will not succeed, if the following
occurs. Avoid these situations.
• After splitting the intermediate-remote pair, the S-VOL is updated.
• After the intermediate-remote pair is split and the journal volume at the intermediate site then
exceeds 70-percent as a result of updates from the primary site.
• When the delta resync P-VOL is updated and then data in the journal volume exceeds
70-percent.
The following provides solutions to other delta resync problems.
• If the delta resync S-VOL status becomes HLDE, you cannot restore it to HOLD by
resynchronizing the pair. You must delete the delta resync pair and recreate it.
• If the delta resync pair’s status does not change after the delta resync operation, check that
all requirements are fulfilled and that any problems explained in this topic have not occurred.
Check the status of the Cnt Ac-J pair and Cnt Ac-J pair for delta resync operation, and make
sure that all pairs are in the required status.
Setting up the 3 Cnt Ac-J DC cascade configuration
Set up a 3 Cnt Ac-J DC cascade configuration using the following procedure. RAID Manager is
used to set up the configuration. To set up a 3DC cascade using Cnt Ac-J and Continuous Access
Synchronous, see “Procedure for setting up 3DC cascade ” (page 143).
128 3 Cnt Ac-J data-center configurations
- 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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