{"id":270,"date":"2013-02-11T09:42:53","date_gmt":"2013-02-11T08:42:53","guid":{"rendered":"http:\/\/www.tinone71.com\/wordpress\/?p=270"},"modified":"2015-01-09T15:47:38","modified_gmt":"2015-01-09T15:47:38","slug":"create-and-remove-physical-volumes-assign-physical-volumes-to-volume-groups-create-and-delete-logical-volumes-create-and-remove-physical-volumes","status":"publish","type":"post","link":"https:\/\/www.tinone71.com\/wp\/?p=270","title":{"rendered":"Create and remove physical volumes, assign physical volumes to volume groups, create and delete logical volumes Create and remove physical volumes"},"content":{"rendered":"
<\/div>

Creating a physical volume in LVM is the first step in the LVM setup. Its the part where you actually tell Red Hat Enterprise Linux that you want a disk to be used for LVM.<\/p>\n

pvcreate is the command used to add the physical volumes, or physical partitions.<\/p>\n

~] pvcreate \/dev\/sdb
\n~] Physical volume “\/dev\/sdb” successfully created<\/p>\n

pvremove is used to disassociate the volume from LVM.<\/p>\n

~] pvremove \/dev\/sdb
\n~] Labels on physical volume “\/dev\/sdb” successfully wiped<\/p>\n

Assign physical volumes to volume groups<\/p>\n

Once that physical volume has been created we can add it to a volume group with the vgcreate or vgextend (if the volume group has already been created).<\/p>\n

If the volume group does not exist, you can create it and add physical volumes in one shot:<\/p>\n

~] vgextend MyVolGroup \/dev\/sdc
\nNo physical volume label read from \/dev\/sdc
\nPhysical volume “\/dev\/sdc” successfully created
\nVolume group “MyVolGroup” successfully extended<\/p>\n

To assign a new physical volume to an existing volume group we use vgextend:<\/p>\n

~] vgextend MyVolGroup \/dev\/sdc
\nVolume group “MyVolGroup” successfully extended<\/p>\n

Similarly if we want to remove \/dev\/sdc from that group we would run ”vgreduce”:<\/p>\n

~] vgreduce MyVolGroup \/dev\/sdc
\nRemoved “\/dev\/sdc” from volume group “MyVolGroup”<\/p>\n

Create and delete logical volumes<\/p>\n

Logical Volumes have similar commands to create and delete as Volume Groups and Physical Volumes.<\/p>\n

To create a new logical volume:<\/p>\n

~] lvcreate -L 100M MyVolGroup
\nLogical volume “lvol0” created<\/p>\n

To display the volume after for confirmation:<\/p>\n

~] lvdisplay MyVolGroup
\n— Logical volume —
\nLV Name \/dev\/MyVolGroup\/lvol0
\nVG Name MyVolGroup
\nLV UUID zwLMev-i63w-7Jpk-XuqZ-VGl7-89Ov-WpoewP
\nLV Write Access read\/write
\nLV Status available
\n# open 0
\nLV Size 100.00 MiB
\nCurrent LE 25
\nSegments 1
\nAllocation inherit
\nRead ahead sectors auto
\n– currently set to 256
\nBlock device 253:2<\/p>\n

To delete the logical volume you would use the LV Name listed in the results of lvdisplay:<\/p>\n

:::bash ~] lvremove \/dev\/MyVolGroup\/lvol0 Do you really want to remove active logical volume lvol0? [y\/n]: y Logical volume “lvol0” successfully removed<\/p>\n","protected":false},"excerpt":{"rendered":"

Creating a physical volume in LVM is the first step in the LVM setup. Its the part where<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/270"}],"collection":[{"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=270"}],"version-history":[{"count":1,"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/270\/revisions"}],"predecessor-version":[{"id":374,"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/270\/revisions\/374"}],"wp:attachment":[{"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=270"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=270"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tinone71.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=270"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}