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4.10
Limiting Throughput
Remote Copy User’s Guide InForm OS Version 2.3.1
4.9 Limiting Throughput
For asynchronous periodic mode Remote Copy (see Asynchronous Periodic Mode on
page 2.24), it might be useful to use the throughput limiting option when setting up links over
leased lines. This option limits the maximum throughput that Remote Copy utilizes for a link.
This is useful, for example, if the leased line charges are based on the bit-rate utilized. If this
option is not used, Remote Copy tries to send data as fast as it can on both links. If the limit is
set, the data is metered and sent out at a rate less than or equal to the set limit. The rate can
be specified in units of gigabytes, megabytes, or kilobytes per second, as follows: .
◆ <throughput> is the throughput limit, followed by g or G to indicate gigabytes per
second,
m or M to indicate megabytes per second, or k or K to indicate kilobytes per
second (if not specified, the default is kilobytes per second).
◆ <target_name> specifies the target name
If you wish to remove the throughput limit, issue the setrcopytarget command as described
above and specify the throughput value as 0, for example,
setrcopytarget tput 0g
<target_name>
.
# setrcopytarget tput <throughput> <target_name>
NOTE: Limiting the throughput results in higher latency for the host writes to the
primary volumes, therefore it is not advisable to set to synchronous mode.
- 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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