sbin/vgcfgbackup /sbin/vgcreate /sbin/vgimportclone /sbin/vgrename Not all the commands listed below are volume group commands though. Typically, they begin with "vg*" and are present in the "/sbin/" directory. Other volume group commands are available. Removed "/dev/sdb2" from volume group "DataVolGroup" Physical volumes are removed from the volume group using the vgreduce command. VG UUID ZexOo9-kO0j-wEUP-2IhM-5IGf-dAio-AuKlDf The vgdisplay command shows information about the specified volume group, or all volume groups if no parameter is specified. Volume group "DataVolGroup" successfully extended The vgextend command allows you to add physical volumes to an existing volume group. Volume group "DataVolGroup" successfully created A volume group can be created using the vgcreate command, passing the group name and a physical volume as parameters.
# Volume Groups (vgcreate, vgextend, vgreduce, vgdisplay)Ī volume group is a collection of physical volumes. sbin/pvck /sbin/pvdisplay /sbin/pvremove /sbin/pvs sbin/pvchange /sbin/pvcreate /sbin/pvmove /sbin/pvresize /sbin/pvscan Not all the commands listed below are physical volume commands though. Typically, they begin with "pv*" and are present in the "/sbin/" directory. Other physical volume commands are available. These physical volumes will be used for the remaining examples in the article. Physical volume "/dev/sdb2" successfully created Writing physical volume data to disk "/dev/sdb2" With the partitions present, we can initialize them as physical volumes. Last sector, +sectors or +size (10487808-20971519, default 20971519):Ĭhanged system type of partition 2 to 8e (Linux LVM)Ĭalling ioctl() to re-read partition table. Switch off the mode (command 'c') and change display units toįirst sector (2048-20971519, default 2048): WARNING: DOS-compatible mode is deprecated. Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
The following output shows the creation of two 5G partitions on the "/dev/sdb" device, both with system ids set to "Linux LVM".ĭevice contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabelīuilding a new DOS disklabel with disk identifier 0xcf1c9c9c.Ĭhanges will remain in memory only, until you decide to write them.Īfter that, of course, the previous content won't be recoverable. When using partitions, the system id of the partitions should be set to "Linux LVM" (8e). Labels on physical volume "/dev/sdb" successfully wiped The pvremove command wipes the device so it is no longer considered a physical volume. Physical volume "/dev/sdb1" successfully created Writing physical volume data to disk "/dev/sdb1" When using whole disks you don't need any special preparation. The pvcreate command initializes a disk or partition as a physical volume for use with the volume manager. If you are completely new to the concept of logical volume management, you may wish to read more about it in the RHEL6 Logical Volume Manager Administration. This flexibility in space allocation is only one aspect of the usefulness of logical volume management, but it is the only one considered in the Red Hat certification exams.
#ORACLE DISK MANAGER FULL#
If a file system becomes full it can be extended by adding a new physical volume (disk or partition) to the volume group, then simply extending the logical volume. This way a single file system can span many disks. A logical volume is built on top of a volume group, which in turn is created using one or more physical volumes (disks or partitions). Using logical volume management, a file system is built on a logical volume. Without a volume manager, once you have used all the space on a disk your file system can not be extended any further. Logical volume management provides a level of abstraction between a file system and the physical disks or partitions.
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