Customized Reporting For Lvm; Format Control - Red Hat ENTERPRISE LINUX 5 - LOGICAL VOLUME MANAGER ADMINISTRATION Manual

Chapter 4. LVM Administration with CLI Commands
To activate logical volumes exclusively on one node, use the lvchange -aey command.
Alternatively, you can use lvchange -aly command to activate logical volumes only on the local
node but not exclusively. You can later activate them on additional nodes concurrently.
You can also activate logical volumes on individual nodes by using LVM tags, which are described in
Appendix C, LVM Object
Appendix B, The LVM Configuration
is described in

4.9. Customized Reporting for LVM

You can produce concise and customizable reports of LVM objects with the pvs, lvs, and vgs
commands. The reports that these commands generate include one line of output for each object.
Each line contains an ordered list of fields of properties related to the object. There are five ways to
select the objects to be reported: by physical volume, volume group, logical volume, physical volume
segment, and logical volume segment.
The following sections provide:
• A summary of command arguments you can use to control the format of the generated report.
• A list of the fields you can select for each LVM object.
• A summary of command arguments you can use to sort the generated report.
• Instructions for specifying the units of the report output.

4.9.1. Format Control

Whether you use the pvs, lvs, or vgs command determines the default set of fields displayed and
the sort order. You can control the output of these commands with the following arguments:
• You can change what fields are displayed to something other than the default by using the -o
argument. For example, the following output is the default display for the pvs command (which
displays information about physcial volumes).
# pvs
PV VG
/dev/sdb1 new_vg lvm2 a-
/dev/sdc1 new_vg lvm2 a-
/dev/sdd1 new_vg lvm2 a-
The following command displays only the physical volume name and size.
# pvs -o pv_name,pv_size
PV PSize
/dev/sdb1 17.14G
/dev/sdc1 17.14G
/dev/sdd1 17.14G
• You can append a field to the output with the plus sign (+), which is used in combination with the -o
argument.
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Tags. You can also specify activation of nodes in the configuration file, which
Fmt Attr PSize
17.14G 17.14G
17.14G 17.09G
17.14G 17.14G
Files.
PFree