Hp XP P9500 Storage Manuel d'utilisateur Page 16
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Table 1 Data paths, logical paths, ports required (continued)
RecommendedMax.Min.ItemCategory
2 or more81From secondary to primary system.
2 or more81Mapping path (path between primary/secondary
system and quorum disk).
641Secondary system target port that can be
connected to an initiator port.
Ports
161Initiator port that can be connected to a secondary
system target port.
Remote Web Console
• Remote Web Console is required for ESAM.
• One Remote Web Console computer can be connected to both the primary and secondary
system.
• You must have storage administrator authority to perform the ESAM operations. If you do not,
you will only be able to view ESAM information.
• To perform any ESAM operation, make sure Remote Web Console is in Modify Mode.
For more information, see the HP P9000 Remote Web Console User Guide.
External storage systems
You can use HP storage systems, original equipment manufacturer (OEM) storage systems, and
other vendors' storage systems (such as IBM or EMC) as connectable external storage systems.
Hosts will recognize these volumes as internal volumes of the P9500 storage system.
When using external storage systems with ESAM, please observe the following:
• Optional external storage systems may be used to store pair data. See the HP P9000 External
Storage for Open and Mainframe Systems User Guide for supported external systems.
• You can connect one external system per ESAM P-VOL, and one per S-VOL.
• The maximum number of external systems that can be connected depends on the number of
the external ports that can be defined for a storage system.
Planning failover
Automatic failover of host operations to the secondary system is part of the ESAM system. Failover
occurs when the primary system cannot continue I/O operations due to a failure. The multipath
software in the host switches I/O to the secondary system.
• The multipath software automatically configures the path to the P-VOL as the owner path when
you create an ESAM pair.
• The path to the S-VOL is automatically configured as the non-owner path.
In the ESAM system, the quorum disk stores the information about the state of data consistency
between the P-VOL and S-VOL, which is used to check whether P-VOL or S-VOL contains the latest
data. If the P-VOL and S-VOL are not synchronized due to a failure, the MCU and RCU determine
which volume should accept host I/O based on the information stored in the quorum disk.
The following figure illustrates failover when a failure occurs at the MCU.
16 Planning, system requirements, and recommendations
- User Guide 1
- DescriptionDateEdition 2
- Contents 3
- 4 Contents 4
- Contents 5 5
- How ESAM works 6
- P9500 storage systems 8
- Pair volumes 8
- Quorum disk 8
- Data replication 9
- Failover 10
- Pair status 10
- Planning workflow 12
- Required hardware 12
- Licenses 13
- License capacity 13
- Pair volume requirements 13
- Quorum disk requirements 14
- Remote Web Console 16
- External storage systems 16
- Planning failover 16
- Planning failover 17 17
- Cache Partition 19
- Cache Residency 19
- Performance Monitor 19
- LUN Manager 19
- Open Volume Management 19
- LUN Expansion 20
- Journal P-VOL 21
- 3 Configuration operations 22
- Installing software 23
- Configuring the quorum disk 24
- Adding a quorum disk ID 25
- 4 Pair operations 26
- Creating pairs 27 27
- 28 Pair operations 28
- Splitting pairs 29
- Resynchronizing pairs 30
- Releasing a pair 31
- 32 Pair operations 32
- What to do next 35
- 5 Monitoring and maintenance 36
- Pair status descriptions 37
- Split types (PSUS status) 38
- Suspend types (PSUE status) 39
- Viewing quorum disks 40
- Maintenance tasks 40
- Maintenance tasks 41 41
- Deleting a quorum disk ID 42
- Maintenance tasks 43 43
- Planned outage of quorum disk 44
- Maintenance tasks 45 45
- 46 Monitoring and maintenance 46
- Recovery workflow 47
- Recovery after power outage 53
- 7 Troubleshooting 57
- Recovery of a pinned track 60
- Recovery of a pinned track 61 61
- 8 Support and other resources 62
- Typographic conventions 63
- Rack stability 64
- A ESAM GUI reference 65
- Paircreate(ESAM) dialog box 70
- Pairsplit-r dialog box 72
- Pairresync dialog box 73
- Pairsplit-S dialog box 74
- Quorum Disk Operation window 75
- Add Quorum Disk ID dialog box 76
- Glossary 77
- 78 Glossary 78
- 80 Index 80
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