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2.18
Remote Copy Connections
Remote Copy User’s Guide InForm OS Version 2.3.1
Figure 2-10. Sending Links for a Remote Copy Pair
2.7.2 Receiving Links
While sending links are used to transmit data, receiving links are used to listen. The receiving
links read Remote Copy data and commands and send them to the appropriate Remote Copy
process for processing. Unlike sending links, there is only a single link of a given type per node,
regardless of the number of sending links of that type.
2.8 Remote Copy Connections
When using Remote Copy for disaster recovery, the backup storage server should reside at a
remote site some distance from the primary server(s) so that the two sites are unlikely to be
affected by the same disaster. The latency of Remote Copy writes increases with distance.
Storage servers in a Remote Copy pair are connected through a dedicated link or through a
network (see Figure 2-16 on page 2.41). You should choose a specific topology based on
several factors, including the distance between the servers and the required bandwidth of the
connection.
Node 6 Node 7
Network
InServ1
Node 2 Node 3
InServ2
172.16.1.12
172.16.2.12
172.16.1.11
172.16.2.11
172.16.1.11
172.16.2.11
172.16.2.12
172.16.1.12
Links to
Target:
Links to
Target:
InServ2
InServ1
- 3PAR Remote Copy 1
- User’s Guide 1
- 3 Remote Copy Setup 5
- 4 Using Remote Copy 6
- AQuick Setup Guide 7
- B Remote Copy Commands 7
- D Comparing MTU Speeds 9
- RH Revision History 9
- Table of Contents 10
- Introduction 11
- 1.1 Audience 12
- 1.2 Related Documentation 12
- 1.3 Organization 13
- 1.4 Typographical Conventions 14
- 1.5 Advisories 15
- Advisories 16
- Remote Copy Overview 17
- 2.1 Overview 19
- 2.2.2 Remote Copy Concepts 20
- 2.4 Remote Copy Pairs 22
- 2.5 Remote Copy Configuration 23
- Remote Copy Configuration 24
- 2.5.3 N-to-1 Configurations 25
- 2.5.4 1-to-N Configurations 27
- 2.6 Remote Copy Targets 31
- Direction of data 32
- 2.7 Remote Copy Links 33
- 2.8 Remote Copy Connections 34
- 2.8.1 IP Networks 35
- 2.9 Remote Copy Operation 36
- 2.9.1 Volume Group Modes 38
- 2.9.1.1 Synchronous Mode 39
- 2.9.1.1.1 Latency 40
- 2.9.2 Synchronization Types 41
- Remote Copy Operation 42
- 2.9.7 Role Reversal 46
- 2.11.1 In Synchronous Mode 47
- Use of Virtual Copy Snapshots 48
- 2.13 Error Handling 51
- 2.13.2 Double Link Failure 52
- Error Handling 53
- 2.13.5 Write Errors 54
- 2.13.6 Read Errors 55
- TCP/IP Network 57
- Requirements and Restrictions 58
- N-to-1 Restrictions 59
- 2.14.2 1-to-N Restrictions 60
- Remote Copy Setup 63
- 3.1 Available Setup Methods 64
- 3.2 Preparing for Setup 64
- 3.4.2.1 Setting the Gateway 71
- <N:S:P>) 72
- 3.5 Setting Up Remote Copy 78
- 3.5.1.4 Start Copying 85
- Node 0 WWN: 20210002AC0000C3 92
- Node 1 WWN: 21210002AC0000C3 92
- <group_name> 100
- Using Remote Copy 107
- 4.1 Management 108
- 4.5 Manual Resynchronization 111
- Modifying Virtual Volumes 115
- 4.9 Limiting Throughput 116
- 4.10 Stopping Remote Copy 117
- 4.11 Remote Copy Commands 117
- Remote Copy Commands 118
- Remote Copy volume group 120
- Task Command 120
- Performance and Scripting 121
- Considerations 121
- 5.1.2 Initial Synchronization 122
- 5.1.3 Distance 122
- 5.1.4 MTU Size 122
- 5.1.5 Autonegotiation 123
- 5.1.6 Remote Copy Mode 123
- 5.1.6.2 Synchronous Mode 124
- 5.3 Scripting Notes 125
- Scripting Notes 126
- Quick Setup Guide 127
- Table A-1. RCIP Setup 128
- A.3 Setting Up Remote Copy 129
- Table A-3. Remote Copy Setup 130
- Setting Up Remote Copy 131
- InForm OS CLI 135
- Administrator’s 135
- RESTRICTIONS 142
- EXAMPLES 142
- Group1 142
- specifier 173
- ■ Port. The port ID 208
- Group1 should be 218
- Example Setup and 219
- Disaster Recovery 219
- Chapter 3, Remote Copy Setup 220
- Remote Copy Setup Examples 221
- On InServ1: 224
- # showrcopy 224
- On InServ2: 225
- On InServ2 229
- InServ2 (Primary) 233
- InServ3 (Primary) 233
- InServ1 (Secondary) 233
- Direction of data replication 233
- InServ2 (Backup) 245
- InServ3 (Backup) 245
- InServ1 (Primary) 245
- ■ On InServA: 258
- ■ On InServB: 259
- ■ On InServC: 260
- InServB 267
- In the example above: 267
- ◆ On InServA: 269
- ◆ On InServB: 270
- ◆ On InServC: 271
- command on InServB and 281
- Primary-Rev) 284
- InServC 287
- -discard option bypasses 299
- To begin data migration: 317
- startrcopygroup -t 321
- Primary-Rev 326
- Primary, rather 329
- Comparing MTU Speeds 331
- Revision History 343
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