Red Hat GLOBAL FILE SYSTEM 5.0, Руководство администратора

Страница: 59 / 112

You can also activate logical volumes on individual nodes by using LVM tags, which are
described in Appendix C, LVM Object Tags . You can also specify activation of nodes in the
configuration file, which is described in Appendix B, The LVM Configuration Files .
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.
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 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 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
Customized Reporting for LVM
47