Red Hat ENTERPRISE LINUX 4 - LVM ADMINISTRATOR Installation Guide download pdf (Page 28)

Chapter 2. LVM Components

As of the Red Hat Enterprise Linux 6 release, you can use the --merge option of the lvconvert

command to merge a snapshot into its origin volume. One use for this feature is to perform system

rollback if you have lost data or files or otherwise need to restore your system to a previous state. After

you merge the snapshot volume, the resulting logical volume will have the origin volume's name, minor

number, and UUID and the merged snapshot is removed. For information on using this option, see

Section 4.4.5, “Merging Snapshot Volumes”.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 131 132

Red Hat Enterprise Linux 6 1
Logical Volume 1
Manager Administration 1
Administration 2
LVM Administrator Guide 2
Edition 1 2
Introduction 7
5. We Need Feedback! 8
6. Document Conventions 8
6.2. Pull-quote Conventions 10
6.3. Notes and Warnings 10
Notes and Warnings 11
1.1. New and Changed Features 13
1.2. Logical Volumes 14
# chkconfig clvmd on 17
# service clvmd start 17
1.5. Document Overview 18
LVM Components 21
2.2. Volume Groups 22
2.3. LVM Logical Volumes 23
2.3.4. Snapshot Volumes 26
LVM Administration Overview 29
3.4. Logical Volume Backup 30
3.5. Logging 31
LVM Administration with CLI 33
Commands 33
4.3.1. Creating Volume Groups 37
4.3.9. Removing Volume Groups 42
# vgmerge -v databases my_vg 43
# lvconvert -m1 vg00/lvol1 51
# lvconvert -m0 vg00/lvol1 51
# lvconvert --merge @some_tag 53
# lvreduce -l -3 vg00/lvol1 54
# lvchange -pr vg00/lvol1 54
# lvrename vg02 lvold lvnew 54
4.6. Online Data Relocation 60
4.8.1. Format Control 61
4.8.2. Object Selection 63
The vgs Command 65
The lvs Command 66
4.8.3. Sorting LVM Reports 69
4.8.4. Specifying Units 69
LVM Configuration Examples 71
5.3. Splitting a Volume Group 73
5.3.1. Determining Free Space 74
5.3.2. Moving the Data 74
5.4.2.3. Moving the Data 77
LVM Troubleshooting 81
Appendix A. The Device Mapper 91
offsetN 94
0 65536 error 97
A.2. The dmsetup Command 101
A.2.2. The dmsetup ls Command 102
dmsetup command 107
B.2. Sample lvm.conf File 109
Sample lvm.conf File 111
Appendix C. LVM Object Tags 121
Appendix D. LVM Volume Group 123
Metadata 123
D.3. Sample Metadata 124
Sample Metadata 125
Appendix E. Revision History 127

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