Hp XP P9500 Storage Manuel d'utilisateur Page 68
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9 Planning and procedures for disaster recovery
This chapter discusses and provides instructions for using Continuous Access Synchronous for
disaster recovery.
Disaster recovery overview
The major steps in preparing for disaster recovery are:
1. Identify the volumes and groups that contain important files and data for disaster recovery.
2. Create Continuous Access Synchronous pairs, paying special attention to the options in P-VOL
Fence Level Settings to ensure that the system responds the way you want in the event of a
failure (see the prerequisites in “Create pairs” (page 49)).
3. Install and configure host failover software between the main and remote sites.
4. Establish file and database recovery procedures. These procedures for recovering volumes
due to control unit failure should already be in place.
5. Make sure that the host system at the primary site is configured to receive sense information
from the P9500 primary system (for example, using RAID Manager or SNMP). This should
also be done at the secondary site if a host is connected to it.
Remote copy and disaster recovery procedures are inherently complex. Consult your HP account
team on sense-level settings and recovery procedures.
Transfer sense information between sites
When the primary system split a Continuous Access Synchronous pair due to an error condition,
the primary and secondary systems send sense information with unit check status to the appropriate
host(s). This is used during disaster recovery to determine the currency of the S-VOL, and must be
transferred to the remote site via the host failover software.
File and database recovery
File recovery procedures are necessary in such cases. These procedures should be the same as
those used for recovering a data volume that becomes inaccessible due to control unit failure.
Continuous Access Synchronous does not provide a procedure for detecting and retrieving lost
updates. To detect and recreate lost updates, you must check other current information (for example,
database log file) that was active at the primary system when the disaster occurred.
The detection and retrieval process can take some time. Your disaster recovery scenario should
be designed so that detection and retrieval of lost updates is performed after the application has
been started at the secondary site.
You should prepare for file and database recovery using files for file recovery (for example,
database log files that have been verified as current).
Switch operations to the secondary site
If a disaster or failure occurs at the primary site, the first disaster recovery activity is to switch your
operations to the secondary site. S-VOLs are recovered individually based on the pair status and
P-VOL fence level information for each pair.
Procedure 22 To switch operations to the secondary site
1. Record the pair status and fence level of each S-VOL.
2. Analyze the currency of the S-VOLs, based on its pair status and P-VOL fence level setting.
See “Analyze S-VOL currency” (page 69). For pairs with P-VOL fence level setting of Never,
further analysis is required. This can be done using sense information transferred via host
failover, or by comparing the contents of an S-VOLs with other files confirmed to be current
68 Planning and procedures for disaster recovery
- Abstract 1
- Contents 3
- 4 Contents 4
- Contents 5 5
- Typical components 7
- Storage systems 7
- Volume pairs 8
- Data path 9
- Consistency groups 9
- Interfaces 14
- Failover software 14
- Initial copy 15
- Update copy 15
- System requirements 16
- Preparing P9500 systems 18
- Planning volume pairs 20
- Planning I/O to the S-VOL 21
- Managing differential data 21
- Synchronous 22
- 16,384Base (16KLDEV, SI/VM) 22
- Planning volume pairs 23 23
- Planning data paths 25
- 3 km4 Gbps 26
- 1.5 km8 Gbps 26
- Planning ports 27
- Planning consistency groups 28
- Host failover software 30
- Continuous Access Journal 32
- Business Copy 33
- LUN Expansion 35
- Virtual LVI/LUN 35
- Cache Residency 35
- LUN Manager 36
- Thin Provisioning 36
- Performance Monitor 36
- Auto LUN 37
- Data Retention 37
- Thin Provisioning Z 38
- Data Retention 39 39
- 5 Configuration operations 40
- 42 Configuration operations 42
- • When CU Free is selected 43
- 44 Configuration operations 44
- 48 Configuration operations 48
- 6 Pair operations 49
- 50 Pair operations 50
- Split pairs 51
- Resynchronize pairs 52
- Release pairs 53
- Change fence level 54
- 7 Monitoring and maintenance 55
- Pair status definitions 56
- Split and suspend types 57
- Export pair information 58
- Monitor copy operations, I/O 59
- Select data to be graphed 60
- Resize graph, save data 61
- Delete logical paths 62
- RCU maintenance 63
- General information 64
- Miscellaneous maintenance 65
- Media maintenance 66
- 8 Data migration 67
- Disaster recovery overview 68
- Analyze S-VOL currency 69
- 10 Troubleshooting 72
- Error codes and messages 76
- Pinned track recovery 83
- Contacting HP 84
- Related information 84
- Typographic conventions 85
- Pair Operation window 88
- Paircreate dialog box 93
- Pairsplit-r dialog box 94
- Pairresync dialog box 94
- Pairsplit-S dialog box 95
- Change Pair Option dialog box 95
- Display Filter dialog box 96
- RCU Operation window 97
- RCU Status dialog box 101
- Add RCU dialog box 103
- RCU Option dialog box 104
- Add Path dialog box 105
- Add SSID dialog box 105
- Usage Monitor window 106
- History window 107
- Export operations history 108
- History window notes 108
- System Option window 109
- Glossary 110
- 112 Index 112
Produits connexes et manuels pour Stockage Hp XP P9500 Storage
Stockage Hp XP7 Storage Manuel d'utilisateur
(304 pages)
(304 pages)
Stockage Hp Surestore NAS Manuel d'utilisateur
(110 pages)
(110 pages)
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