Red Hat ENTERPRISE LINUX 5 - LOGICAL VOLUME MANAGER ADMINISTRATION Guida di Installazione Scaricare il pdf (Pagina 12)

Figure 1.1. LVM Logical Volume Components

For detailed information on the components of an LVM logical volume, see Chapter 2, LVM

Components.

3. Running LVM in a Cluster

The Clustered Logical Volume Manager (CLVM) is a set of clustering extensions to LVM. These

extensions allow a cluster of computers to manage shared storage (for example, on a SAN) us-

ing LVM.

The clmvd daemon is the key clustering extension to LVM. The clvmd daemon runs in each

cluster computer and distributes LVM metadata updates in a cluster, presenting each cluster

computer with the same view of the logical volumes.

Figure 1.2, “CLVM Overview” shows a CLVM overview in a Red Hat cluster.

3. Running LVM in a Cluster

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 91 92

Table of Contents 4
1. About This Guide 7
2. Audience 7
3. Software Versions 7
4. Related Documentation 7
5. Document Conventions 8
Important 9
1. Logical Volumes 10
2. LVM Architecture Overview 11
3. Running LVM in a Cluster 12
4. Document Overview 13
Chapter 2. LVM Components 15
2. Volume Groups 17
3. LVM Logical Volumes 17
Figure 2.2. Extent Mapping 18
3.2. Striped Logical Volumes 20
3.3. Mirrored Logical Volumes 21
3.4. Snapshot Volumes 22
Chapter 3. LVM Administration 24
Overview 24
4. Logical Volume Backup 25
5. Logging 25
• external log function 26
LVM Configuration Files 26
CLI Commands 27
3.1. Creating Volume Groups 31
3.3. Displaying Volume Groups 32
3.8. Removing Volume Groups 35
3.9. Splitting a Volume Group 35
3.10. Combining Volume Groups 35
3.12. Renaming a Volume Group 36
4.1. Creating Logical Volumes 37
4.3. Resizing Logical Volumes 41
4.5. Renaming Logical Volumes 42
4.6. Removing Logical Volumes 42
4.8. Growing Logical Volumes 43
5. Creating Snapshot Volumes 46
7. Online Data Relocation 48
Nodes in a Cluster 48
9.1. Format Control 49
9.2. Object Selection 51
Table 4.1. pvs Display Fields 52
The vgs Command 53
The lvs Command 54
Table 4.3. lvs Display Fields 56
9.3. Sorting LVM Reports 57
9.4. Specifying Units 58
Chapter 5. LVM Configuration 60
Examples 60
1.4. Creating the File System 61
3. Splitting a Volume Group 62
3.1. Determining Free Space 63
3.2. Moving the Data 63
4.2.3. Moving the Data 66
Volume Group 73
Appendix A. The Device Mapper 76
Appendix B. The LVM 77
Configuration Files 77
2. Sample lvm.conf File 78
Appendix C. LVM Object Tags 84
Appendix D. LVM Volume Group 86
Metadata 86
3. Sample Metadata 87

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