Red Hat ENTERPRISE LINUX 5 - LOGICAL VOLUME MANAGER ADMINISTRATION Guida di Installazione Pagina 58
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To display a reverse sort, precede a field you specify after the -O argument with the - character.
# pvs -o pv_name,pv_size,pv_free -O -pv_free
PV PSize PFree
/dev/sdd1 17.14G 17.14G
/dev/sdb1 17.14G 17.14G
/dev/sdc1 17.14G 17.09G
9.4. Specifying Units
To specify the unit for the LVM report display, use the --units argument of the report command.
You can specify (b)ytes, (k)ilobytes, (m)egabytes, (g)igabytes, (t)erabytes, (e)xabytes,
(p)etabytes, and (h)uman-readable. The default display is human-readable. You can override
the default by setting the units parameter in the global section of the lvm.conf file.
The following example specifies the output of the pvs command in megabytes rather than the
default gigabytes.
# pvs --units m
PV VG Fmt Attr PSize PFree
/dev/sda1 lvm2 -- 17555.40M 17555.40M
/dev/sdb1 new_vg lvm2 a- 17552.00M 17552.00M
/dev/sdc1 new_vg lvm2 a- 17552.00M 17500.00M
/dev/sdd1 new_vg lvm2 a- 17552.00M 17552.00M
By default, units are displayed in powers of 2 (multiples of 1024). You can specify that units be
displayed in multiples of 1000 by capitalizing the unit specification (B, K, M, G, T, H).
The following command displays the output as a multiple of 1024, the default behavior.
# pvs
PV VG Fmt Attr PSize PFree
/dev/sdb1 new_vg lvm2 a- 17.14G 17.14G
/dev/sdc1 new_vg lvm2 a- 17.14G 17.09G
/dev/sdd1 new_vg lvm2 a- 17.14G 17.14G
The following command displays the output as a multiple of 1000.
# pvs --units G
PV VG Fmt Attr PSize PFree
/dev/sdb1 new_vg lvm2 a- 18.40G 18.40G
/dev/sdc1 new_vg lvm2 a- 18.40G 18.35G
/dev/sdd1 new_vg lvm2 a- 18.40G 18.40G
You can also specify (s)ectors (defined as 512 bytes) or custom units.
The following example displays the output of the pvs command as a number of sectors.
# pvs --units s
PV VG Fmt Attr PSize PFree
/dev/sdb1 new_vg lvm2 a- 35946496S 35946496S
/dev/sdc1 new_vg lvm2 a- 35946496S 35840000S
/dev/sdd1 new_vg lvm2 a- 35946496S 35946496S
9.4. Specifying Units
49
- 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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