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Veritas Volume Manager 5.0
1
Administrator’s Guide
1
Legal Notices
2
Contents
4
6 Contents
5
7Contents
6
8 Contents
7
Chapter 7 Creating volumes
8
10 Contents
9
11Contents
10
12 Contents
11
13Contents
12
Chapter 14 Administering
13
Appendix A Commands summary
14
Glossary 521
15
Index 531
15
Understanding Veritas
16
Volume Manager
16
VxVM and the operating system
18
Disk arrays
20
Multipathed disk arrays
21
Device discovery
21
Enclosure-based naming
22
Virtual objects
25
Disk groups
27
VM disks
27
Subdisks
28
Volume layouts in VxVM
33
Layout methods
34
Concatenation and spanning
34
Striping (RAID-0)
37
Mirroring (RAID-1)
41
RAID-5 (striping with parity)
44
Left-symmetric layout
47
RAID-5 logging
49
Layered volumes
50
Online relayout
53
Volume resynchronization
58
Dirty region logging
59
Log subdisks and plexes
60
Sequential DRL
60
Data volume configuration
61
Volume snapshots
62
FastResync
65
FastResync enhancements
66
Non-persistent FastResync
66
Persistent FastResync
67
DCO volume versioning
67
Version 0 DCO volume layout
68
Version 20 DCO volume layout
68
FastResync limitations
73
Hot-relocation
74
Volume sets
74
Administering disks
76
Disk device naming in VxVM
77
80 Administering disks
79
Disk devices
79
Partial device discovery
81
Disk categories
82
84 Administering disks
83
# swinstall -s /cdrom vrtsda
83
# vxdctl enable
83
# swremove vrtsda
83
Listing excluded disk arrays
85
SNO length
87
90 Administering disks
89
Adding a disk to VxVM
96
Reinitializing a disk
100
Rootability
101
Root disk mirrors
102
Booting root volumes
103
Dynamic LUN expansion
107
109Administering disks
108
Removing disks
109
Removing a disk with subdisks
110
Removing and replacing disks
111
Enabling a disk
116
Taking a disk offline
117
Renaming a disk
118
Reserving disks
118
Displaying disk information
119
Controlling Powerfail Timeout
121
Enabling or disabling PFTO
122
124 Administering disks
123
Administering dynamic
124
How DMP works
125
How DMP monitors I/O on paths
127
Load balancing
128
■ active
145
■ nomanual
145
■ nopreferred
145
■ preferred [priority=N]
145
Displaying the I/O policy
146
Specifying the I/O policy
146
■ adaptive
147
■ adaptiveminq
147
■ minimumq
149
■ priority
149
■ round-robin
149
■ singleactive
149
Renaming an enclosure
154
■ check_all
159
■ check_alternate
159
■ check_disabled
159
■ check_periodic
159
Creating and
164
/dev/vx/dsk/mktdg/mktvol
166
Creating a disk group
169
Adding a disk to a disk group
170
Deporting a disk group
172
Importing a disk group
173
Writing a new UDID to a disk
175
Renaming a disk group
182
774226267.1025.tweety
183
Source disk group
196
Target disk group
197
Splitting disk groups
204
Joining disk groups
205
Disabling a disk group
206
Destroying a disk group
207
Upgrading a disk group
207
Moving subdisks
216
Splitting subdisks
216
Joining subdisks
217
Associating log subdisks
219
Removing subdisks
220
Changing subdisk attributes
220
Creating a striped plex
223
Displaying plex information
223
ACTIVE plex state
224
CLEAN plex state
224
DCOSNP plex state
224
SNAPTMP plex state
226
STALE plex state
226
TEMP plex state
226
TEMPRM plex state
226
Plex condition flags
227
Plex kernel states
228
Taking plexes offline
229
Detaching plexes
230
Reattaching plexes
230
Moving plexes
231
Copying volumes to plexes
232
Changing plex attributes
233
Creating volumes
234
Types of volume layouts
235
Creating a volume
237
Using vxassist
238
Creating a volume on any disk
242
247Creating volumes
246
248 Creating volumes
247
Creating a mirrored volume
248
250 Creating volumes
249
Creating a striped volume
252
Creating a RAID-5 volume
255
Creating tagged volumes
256
Accessing a volume
261
Administering volumes
262
Volume states
264
/CLEAN flag). If the
265
Specifying task tags
266
Managing tasks with vxtask
267
Using the vxtask command
268
Stopping a volume
269
Starting a volume
270
Adding a mirror to a volume
270
Mirroring all volumes
271
Removing a mirror
272
274 Administering volumes
273
# vxplex -g mydg dis vol01-02
273
Disabling and re-enabling DRL
277
279Administering volumes
278
Adding a RAID-5 log
282
Resizing a volume
283
Extending to a given length
285
Extending by a given length
285
Resizing volumes using vxvol
286
Setting tags on volumes
287
Removing a volume
289
Moving volumes from a VM disk
289
Disabling FastResync
292
Performing online relayout
293
Tagging a relayout operation
297
301Administering volumes
300
302 Administering volumes
301
Administering volume
302
Full-sized instant snapshots
306
Cascaded snapshots
311
Creating multiple snapshots
316
Creating instant snapshots
318
Removing a snapshot mirror
335
Removing an instant snapshot
340
Growing and shrinking a cache
346
Removing a cache
346
Reattaching a snapshot volume
351
Creating a volume set
361
Configuring off-host
368
on the volume. The
372
Implementing decision support
373
Administering
378
How hot-relocation works
379
Spare Disk
381
# vxdg [-g diskgroup] spare
385
Make a disk available for
388
you can choose to
390
Global detach policy
404
Local detach policy
405
Disk group failure policy
406
Cluster reconfiguration
409
Reason Description
411
Volume reconfiguration
412
■ cluster ID
413
■ node IDs
413
■ master node ID
413
■ role of the node
413
Node shutdown
415
Node abort
416
Cluster shutdown
416
Import lock
417
Failover
417
Listing shared disk groups
420
Creating a shared disk group
421
Site A Site B
431
Disk Group
431
Volume V
431
Command Description
437
Automatic site reattachment
439
Recovery from host failure
441
Recovery from storage failure
441
Recovery from site failure
442
Using Storage Expert
444
How Storage Expert works
445
Before using Storage Expert
445
Running Storage Expert
445
Discovering what a rule does
446
Running a rule
446
Rule result types
447
Setting rule attributes
447
Recovery time
448
Disk striping
452
Hardware failures
453
System name
453
455Using Storage Expert
454
Rule Attribute Default
457
Description
457
462 Using Storage Expert
461
Performance monitoring
462
Striping
463
Mirroring
463
Performance guidelines
464
Volume read policies
465
Tracing volume operations
467
Printing volume statistics
467
Using performance data
468
Tuning VxVM
471
Tunable parameters
474
Commands summary
486
Table A-2 Administering disks
488
Table A-6 Creating volumes
497
Online manual pages
506
Name Description
507
Section 4 — file formats
509
Configuring Veritas
510
Adding foreign devices
511
Adding disks to disk groups
511
Mirroring guidelines
513
Striping guidelines
514
RAID-5 guidelines
515
Hot-relocation guidelines
515
Configuring cluster support
517
Reconfiguration tasks
519
Glossary
520
/dev/vx/dsk
529
532 Index
531
533Index
532
534 Index
533
535Index
534
536 Index
535
537Index
536
538 Index
537
539Index
538
540 Index
539
541Index
540
542 Index
541
543Index
542
544 Index
543
545Index
544
546 Index
545
547Index
546
548 Index
547
549Index
548
550 Index
549
551Index
550
552 Index
551
553Index
552
554 Index
553
555Index
554
556 Index
555
557Index
556
558 Index
557
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