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The swap option of the takeover command allows swapping of the primary and secondary volume
designations, so if the primary and secondary volume are switched due to a server error or package
transfer, pair operation can be continued using the reversed volumes. When control is handed
back over to the original node, swapping the volume designations again eliminates the need of
copying them. In addition, the takeover command has the option to allow the secondary volume
to be logically separated (for the purpose of recovery from a disaster at the original operating
site). The takeover command has four functions designed for HA software operation: Takeover-switch,
swap-takeover, SVOL-takeover, and PVOL-takeover. This command is not available for Business
Copy.
The Takeover-switch function
The control scripts activated by HA software are used by all nodes of a cluster in exactly the same
manner so they have no discrimination between primary and secondary pair volumes (they just
know the near and far disk in a pair). Thus, the takeover command, when activated by a control
script, must check the combination of attributes of volumes possessed by the local and remote
nodes and determine the proper takeover action. The table below shows the takeover actions.
Table 29 Near/Local and Far/Remote Volume Attributes and Takeover Actions
Takeover actionRemote nodeLocal node (Takeover node)
P-VOL statusVolume attributeFence and statusVolume attribute
Reject-SMPL-SMPL
Nop-Takeover
1
-P-VOL
Unconformable-S-VOL
Reject-Unknown
Reject-SMPLFence == Data or
Status && pair status
P-VOL (primary)
Unconformable-P-VOL
== PSUE or PDUB or
MINAP == 0
PVOL-Takeover
2
-S-VOL
PVOL-Takeover
2
-Unknown
Reject-SMPLOthers
Unconformable-P-VOL
Nop-Takeover
1
-S-VOL
Nop-Takeover
1
-Unknown
Nop-Takeover
1
--Status == SSWS (After
SVOL_SSUS-takeover)
S-VOL (secondary)
Unconformable-SMPLOther than SSWS
Swap-Takeover
2
PAIR or PFULP-VOL
SVOL-Takeover
2
Others
Unconformable-S-VOL
SVOL-Takeover
2
-Unknown
Notes:
1. No action needed to allow local writes.
2. Required to allow local writes.
Nop-takeover: No operation is done to allow local writes, though the takeover command is
accepted. Personality swaps must be accomplished in another way.
150 Data replication operations with RAID Manager
- Abstract 1
- DescriptionDateEdition 2
- Contents 3
- 4 Contents 4
- Contents 5 5
- 6 Contents 6
- Contents 7 7
- 8 Contents 8
- 1 Overview 9
- Provisioning function 10
- Command execution modes 11
- Precheck function 11
- User authentication 13
- 14 Overview 14
- Data protection 15
- ◦ A command server 16
- Command device 16
- Command device guarding 17
- # horcctl -DI 18
- AI = 14 TI = 0 CI = 1 18
- Command competition 20
- Command flow 20
- HORCM operational environment 21
- Configuration definition file 25
- HORCM_MON 27
- HORCM_CMD 29
- \\.\CMD-30095-250-CL1-A 29
- Business Copy 37
- RAID Manager software files 41
- RAID Manager log files 45
- RAID Manager trace files 47
- Command logging for audit 47
- Logging raidcom command 49
- /var/log/raidcom.err 50
- User-created files 52
- User environment variable 52
- Hardware requirements 54
- I/O Traffic Control 54
- Security setting 54
- Controlling User Role 56
- Controlling user resources 57
- Target resources 58
- Resource lock function 63
- Context check 65
- [-clpr <clpr#>] 66
- Configuration check 70
- LDEV grouping function 72
- LDEV grouping function 73 73
- Define device group 75
- 4. Device group deletion 76
- Device group creation 77
- LDEV addition to device group 77
- Device group deletion 79
- Copy group function 80
- When creating a copy group 81
- When deleting a copy group 81
- Copy group creation 82
- LDEV addition to a copy group 82
- LDEV deletion from copy group 83
- Copy group deletion 84
- LDEV grouping function 85 85
- LDEV grouping function 87 87
- Journal Z (continued) 90
- HORCM_VCMD 94
- 4 Starting up RAID Manager 100
- One instance 101
- Two instances 101
- ◦ for starting [HORCM0]: 104
- About provisioning operations 106
- Asynchronous commands 107
- LDEV nickname function 108
- Operation method 114
- Resource group operations 116
- Execution example 117
- Internal volume operations 118
- Script examples 121
- Operational flow 127
- External volume operations 132
- Script Examples 133
- Cache Partition operations 135
- Displaying CLPR information 136
- Features of paired volumes 143
- Synchronous 144
- Business Copy operations 145
- Business Copy cascading pairs 146
- Business Copy operations 147 147
- The Takeover-switch function 150
- Swap-takeover function 151
- SVOL-takeover function 152
- PVOL-takeover function 153
- Journal operations 155
- # pairsplit -g oradb 159
- # pairdisplay -g oradb -fc 159
- Access Journal volumes 161
- Setting the fence level 166
- Snapshot operations 167
- Creating a Snapshot pair 168
- Snapshot pair status 168
- Controlling Auto LUN 169
- Specifications for Auto LUN 170
- Commands to control Auto LUN 171
- Restrictions for Auto LUN 175
- Overview 175
- (3) Propagating Error suspend 176
- Command specifications 177
- Notice on system operation 180
- Configuration examples 181
- (1) Cnt Ac-J 2x2 182
- Remote volume discovery 183
- Discovering a remote volume 184
- Data protection operations 186
- Data Protection facility 189
- Data Protection facility 191 191
- Permission command 192
- New options for security 193
- Permitting protected volumes 194
- Environment variables 195
- $HORCMPERM 196
- Volume discovery function 198
- GPT disk for Windows 205
- Host group control 207
- SLPR configuration examples 210
- Dual Hosts 211
- 9 Troubleshooting 214
- System log messages 217
- Command error messages 218
- Specific error codes 227
- SSB codes 228
- Calling the HP Support Center 296
- Contacting HP 297
- Related information 297
- Typographic conventions 298
- Glossary 300
- 302 Index 302
- 304 Index 304
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