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HA Failover and failback 355
Scenario
1. A failure occurs in host A or in the P-VOL.
2. Host B detects the failure in host A and issues the takeover command
to make the S-VOL usable. Host
B takes over from host A and continues
processing.
In the case of a host A failure, a takeover command executes a
swap-takeover.
In the case of a P-VOL failure, a takeover command executes a
S-VOL-SSUS-takeover.
3. While host B is processing, the P-VOL and S-VOL are swapped using
pairresync –swaps and the delta data (BITMAP) updated by host B is
fed back to host
A.
4. When host A recovers from the failure, host A takes over processing
from host
B through the horctakeover swap-takeover command.
- HP StorageWorks 1
- RAID Manager XP 1
- User’s Guide 1
- Contents 3
- Contents 5 5
- Contents 7 7
- About this guide 9
- HP technical support 10
- HP storage website 10
- Document conventions 11
- Revision history 12
- Warranty statement 13
- About this guide 15 15
- Description 17
- Continuous Access (CA) 19
- Business Copy (BC) 20
- Pairs and pair management 21
- Creating SnapShot pairs 22
- RAID Manager instances 23
- RAID Manager command device 25
- Shell/iX> cd /tmp/raidmgr 34
- Shell/iX> ./RMinstsh 34
- Installation prerequisites 37
- Installation 38
- Directory locations 39
- Services file 40
- Hosts file 40
- Windows NT/2000/2003 41
- Open VMS 42
- Parameter 43
- Default 43
- Type Limit 43
- HORCM_MON section 44
- XP Array 45
- HORCM_CMD section 46
- HORCM_DEV section 49
- Feature SMPL P-VOL S-VOL 50
- Example HORCM_DEV 51
- HORCM_LDEV section 52
- HORCM_INST section 53
- Starting the instances 54
- Environment variables for CA 56
- Paired volume configuration 57
- Using RAID Manager 59
- RAID Manager pair commands 60
- Using RAID Manager 61 61
- Vo lu me 63
- Secondary 63
- Vo lu m e 63
- Vo l um e 65
- Using RAID Manager 67 67
- File types and structure 68
- Using RAID Manager 69 69
- Title File name, Location 69
- Executable for 69
- Using RAID Manager 71 71
- Log files 72
- Windows NT/2000/2003 Systems 73
- MPE/iX Systems 73
- OpenVMS Systems 73
- Log directories 74
- Output to host log file 74
- User-created files 75
- RM environment variables 76
- Using RAID Manager 77 77
- RM protection 79
- Permission command 81
- Protection facility support 81
- Command device configuration 82
- Visibility to Grp2 only 83
- Visibility to Grp1,Grp3,Grp4 83
- Naming the $HORCMPERM file 87
- UNIX systems 87
- Verifying a group for vg01: 87
- Windows NT/2000/2003 systems 88
- Verifying a group for DB1: 88
- # lsdev –C –c disk 89
- $HORCMPROMOD 90
- $HORCMPERM 90
- # horcctl –D 91
- Using RAID Manager 93 93
- Using RAID Manager 95 95
- Restrictions 96
- Example 1 97
- Example: 99
- LUN Security Extension 101
- Using RAID Manager 103 103
- General commands 106
- Windows NT/2000/2003 commands 107
- Data integrity check commands 108
- Syntax horcctl –h 109
- # horcctl -D 111
- Syntax HP-UX: 113
- Examples 124
- and system 128
- # lsdev -C -c disk 129
- DYNIX/ptx 130
- Configuration file: 133
- Example 144
- Async-CA Sync-CA BC 151
- Syntax pairevtwait –h 157
- Report pair transition status 162
- # pairmon –allsnd –nowait 164
- –restore option is used, the 169
- S-VOL 170
- In the P-VOL case, this 172
- Split a pair 173
- CA Operation 174
- –FCA option. In the example 174
- BC Operation 174
- –FBC option. In the example 174
- # pairvolchk -g oradb 193
- –c argument is specified 194
- –s 1 x x x x x x COPY* 194
- –ss 1 x x x x x x COPY* 194
- BC with CT Group: 196
- Syntax raidar –h 197
- Related 199
- Information 199
- Syntax raidqry –h 200
- Display Example # raidqry -l 201
- Syntax raidscan 202
- –. For BC, the MU# is 209
- 0, 1, or 2 209
- –find option 210
- SCSI Port Specification 212
- Manager command 217
- Any general RM command 217
- Syntax RM_command –x mount 220
- [SYNC] C: HarddiskVolume3 230
- Data Integrity Check Commands 235
- [rtime] 240
- 0 0 1 1 242
- 0 0 0 1 242
- JNLS Other info 259
- P-JNL S-JNL QCNT AP 259
- # raidvchkscan -v jnlt 260
- Troubleshooting RAID Manager 263
- Error reporting 264
- Operational notes 265
- (continued) 266
- Error Solution 267
- Error codes 268
- $HORCM_CONF 269
- Command return values 270
- Command Error Error Message 272
- Command errors 273
- Command Error Problem Action 275
- Configuration file examples 279
- 0 (or 1 or 2) means BC only 280
- Cascading BC 281
- Connecting CA and BC 283
- A B C D 285
- CL1-A, T1, L1 and 288
- CL1-D, T2, L1 288
- A B 290
- (/etc/horcm0.conf) 295
- (/etc/horcm1.conf) 295
- # setenv HORCMINST 0 296
- (/etc/horcm.conf) 299
- # setenv HORCC_MRCF 1 301
- # paircreate -g Oradb -vl 301
- # paircreate -g Oradb -vr 302
- # paircreate -g Oradb1 -vl 303
- # setenv HORCC_MRCF 1 304
- # paircreate -g Oradb1 -vr 304
- # paircreate -g Oradb2 -vr 306
- Instance 0: 316
- Two-host BC configuration 317
- Two BC mirror configuration 319
- Three-host BC configuration 321
- Device group configuration 323
- HA Failover and failback 325
- HA Failover and failback 327 327
- Table terms: 328
- HA Failover and failback 329 329
- HA Failover and failback 331 331
- State No.1 332
- HA Failover and failback 333 333
- 9). Therefore, the 334
- HA Failover and failback 335 335
- ESCON/FC failure 335
- P-VOL group status 336
- Another PVOL-Takeover Case 337
- → SSUS) state 338
- → PSUE for async-CA 338
- Async-CA specific behavior 339
- HA Failover and failback 341 341
- –t timeout option) 342
- HA Failover and failback 343 343
- SMPL — — Needs to be 344
- P-VOL — — Needs to be 344
- S-VOL COPY data Inconsistent 344
- HA Failover and failback 345 345
- Object volume 345
- Currency 345
- SVOL_Takeover 345
- **no action needed to allow 346
- HA Failover and failback 349 349
- –t timeout option 351
- Scenario 355
- Abnormal termination 357
- Fibre Channel addressing 359
- Fibre Channel TID 360
- (QLogic or Emulex driver) 363
- STDIN file formats 365
- Porting notice for MPE/iX 367
- MPEKXU3 369
- Installing 370
- Uninstalling 370
- MPE socket hang 370
- Porting notice for MPE/iX 371 371
- /users/HORCM 372
- Make a JOB control file 373
- HORCM_DEV 375
- HORCM_INST 375
- Porting notice for OpenVMS 377
- HORCM daemon startup 379
- Command device 380
- Syslog function 381
- Startup log files 382
- Using the spawn command 382
- To install RAID Manager: 384
- To uninstall RAID Manager: 384
- DKA150 - - - - - - - 385
- $1$DGA145…) as either 386
- SHOW DEVICE command and the 386
- LNM$TEMPORARY_MAILBOX in the 387
- Executing a “horcmstart 0” 388
- $ HORCMINST := 0 389
- $ horcmshutdown 0 389
- HORCM Shutdown inst 0 !!! 389
- DCL command examples 391
- in the 397
- DEVICE_FILE UID S/F PORT 398
- LUN SERIAL LDEV PRODUCT_ID 398
- Starting “horcmstart 0 1” 399
- Glossary 401
- Glossary 403 403
- Glossary 405 405
- Glossary 407 407
- Index 409 409
- Index 411 411
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