Hp XP P9500 Storage User Manual Page 82
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4. For Inflow Control, specify whether to restrict inflow of update I/Os to the journal volume
(slows delay response to hosts).
For example, you could have a 100 GB-bandwidth data path with three journals using it. If
an important database is saved to a primary volume in one of the journals, with data of lesser
importance in the other journals, you may decide to restrict the Inflow Control for the less
important journals while not restricting control to the important journal.
Yes indicates inflow will be restricted. No indicates inflow will not be restricted.
If Yes is selected and the metadata or the journal data is full, the update I/Os may stop.
5. For Data Overflow Watch, specify the number of seconds for the system to monitor write data
to the journal volume when the journal volume is full 100%. Range is 0-600 seconds. Default
is 60 seconds.
If Inflow Control is No, Data Overflow Watch is disabled.
NOTE: The metadata area is not a candidate for Data Overflow Watch. If the metadata
area is full, the journal is suspended with an error regardless of the value of Data Overflow
Watch.
See status definitions for PFUL and PFUS in “Pair status definitions” (page 66) for additional
key information.
In a 3 Cnt Ac-J DC multi-target configuration, when two or more mirrors in the primary site
are in Active status, if the free space in the journal data area or metadata area decreases to
a critical level, one of the mirrors in the journal will be suspended with an error regardless of
the value of the Data Overflow Watch.
6. For Use of Cache, specify whether to store journal data (initial copy or resynchronization data)
in the cache memory on the remote side (restore journal).
- Use: Journal data will be stored in the cache. When there is insufficient space in the cache,
journal data will also be stored into the journal volume. This setting only takes effect on the
journal volumes of RAID-5 or RAID-6.
- Not Use: Journal data is not stored in the cache.
- Blank: The current setting of Use of Cache will remain unchanged.
NOTE: This setting does not effect master journals unless the RAID Manager horctakeover
command is used to change a master journal into a restore journal.
7. Click Set when finished.
8. Review settings in the Preview list in the Journal Operation window.
• To modify a setting, right click and select Modify.
• To cancel a setting, right click and select Cancel.
9. Click Apply to apply the settings. If an error occurs, the error code appears in the right-most
column of the Preview list. To view detailed information about the error, right click the error
code and select Error Detail.
Changing options used by mirrors
Most pair operations are performed on multiple pairs. This is done using a journal or mirrors. You
can change the following options that affect the pairs in a mirror:
• Unit of Path Watch Time—establishes the unit of path watch time.
• Copy Pace—establishes the pace at which data is copied
• Path Watch Time—establishes the amount of time before a blocked path results in the mirror
being split
82 Maintaining the system
- 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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