Red Hat GLOBAL FILE SYSTEM 5.0, Руководство администратора

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Are you sure you want to proceed? [y/n] y
Device: /dev/striped_vol_group/striped_logical_volume
Blocksize: 4096
Filesystem Size: 492484
Journals: 1
Resource Groups: 8
Locking Protocol: lock_nolock
Lock Table:
Syncing...
All Done
The following commands mount the logical volume and report the file system disk space usage.
[root@tng3-1 ~]# mount /dev/striped_vol_group/striped_logical_volume /mnt
[root@tng3-1 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
13902624 1656776 11528232 13% /
/dev/hda1 101086 10787 85080 12% /boot
tmpfs 127880 0 127880 0% /dev/shm
/dev/striped_vol_group/striped_logical_volume
1969936 20 1969916 1% /mnt
3. Splitting a Volume Group
In this example, an existing volume group consists of three physical volumes. If there is enough
unused space on the physical volumes, a new volume group can be created without adding new
disks.
In the initial set up, the logical volume
mylv
is carved from the volume group
myvol
, which in
turn consists of the three physical volumes,
/dev/sda1
,
/dev/sdb1
, and
/dev/sdc1
.
After completing this procedure, the volume group
myvg
will consist of
/dev/sda1
and
/dev/sdb1
. A second volume group,
yourvg
, will consist of
/dev/sdc1
.
3.1. Determining Free Space
You can use the
pvscan
command to determine how much free space is currently available in
the volume group.
[root@tng3-1 ~]# pvscan
PV /dev/sda1 VG myvg lvm2 [17.15 GB / 0 free]
PV /dev/sdb1 VG myvg lvm2 [17.15 GB / 12.15 GB free]
PV /dev/sdc1 VG myvg lvm2 [17.15 GB / 15.80 GB free]
Total: 3 [51.45 GB] / in use: 3 [51.45 GB] / in no VG: 0 [0 ]
Chapter 5. LVM Configuration Examples
62