{"id":6103,"date":"2016-07-31T16:23:24","date_gmt":"2016-07-31T08:23:24","guid":{"rendered":"http:\/\/rmohan.com\/?p=6103"},"modified":"2016-07-31T16:23:24","modified_gmt":"2016-07-31T08:23:24","slug":"how-to-create-lvm-using-pvcreate-vgcreate-lvcreate-and-lvextend-commands","status":"publish","type":"post","link":"https:\/\/mohan.sg\/?p=6103","title":{"rendered":"HOW TO CREATE LVM USING PVCREATE, VGCREATE, LVCREATE, AND LVEXTEND COMMANDS"},"content":{"rendered":"

HOW TO CREATE LVM USING PVCREATE, VGCREATE, LVCREATE, AND LVEXTEND COMMANDS<\/strong><\/p>\n

What is LVM?<\/p>\n

LVM is a tool for logical volume management which includes allocating disks, striping, mirroring and resizing logical volumes. With LVM, a hard drive or set of hard drives is allocated to one or more physical volumes.<\/p>\n

How to setup LVM in RHEL 7<\/p>\n

Once the physical disk space has been made available to the host, run the following command to identify the disk location:<\/p>\n

fdisk -l<\/p>\n

Disk \/dev\/sdb: 4294 MB, 4294967296 bytes, 8388608 sectors
\nUnits = sectors of 1 * 512 = 512 bytes
\nSector size (logical\/physical): 512 bytes \/ 512 bytes
\nI\/O size (minimum\/optimal): 512 bytes \/ 512 bytes
\nDisk label type: dos
\nDisk identifier: 0x5eee65f8
\nThe output of the above command identifies the location of the 4 GB disk as being located in \/dev\/sdb. The next step involves issuing the following command (replace \/dev\/sdv with the output you receive from the above command):<\/p>\n

[root@slave ~]# fdisk \/dev\/sdb
\nTyp Type n to create a new partition and press enter three times until you reach the Last sector prompt. Enter +4GB here and press enter. Type in w and press enter to make the changes live. Issuing partprobe makes the partition live without rebooting the host.<\/p>\n

[root@slave ~]# partprobe
\nThe next step involves creating a physical volume.<\/p>\n

[root@slave ~]# pvcreate \/dev\/sdb1
\n Physical volume “\/dev\/sdb1” successfully created
\nRun a pvscan to pickup the changes.<\/p>\n

[root@slave ~]# pvscan
\n PV \/dev\/sda2 VG rhel lvm2 [7.51 GiB \/ 0 free]
\n Total: 1 [7.51 GiB] \/ in use: 1 [7.51 GiB] \/ in no VG: 0 [0 ]
\nWe now need to create a volume group.<\/p>\n

[root@slave ~]# vgcreate roldy \/dev\/sdb1
\n Volume group “roldy” successfully created
\nInside of this volume group, we will now create a logical partition.<\/p>\n

[root@slave ~]# lvcreate roldy –name snookicoco \/dev\/sdb1 -L 200MB
\n Logical volume “snookicoco” created
\nFormat the file system with xfs using the below command:<\/p>\n

[root@slave ~]# mkfs.xfs \/dev\/roldy\/snookicoco
\nmeta-data=\/dev\/roldy\/snookicoco isize=256 agcount=4, agsize=12800 blks
\n = sectsz=512 attr=2, projid32bit=1
\n = crc=0
\ndata = bsize=4096 blocks=51200, imaxpct=25
\n = sunit=0 swidth=0 blks
\nnaming =version 2 bsize=4096 ascii-ci=0 ftype=0
\nlog =internal log bsize=4096 blocks=853, version=2
\n = sectsz=512 sunit=0 blks, lazy-count=1
\nrealtime =none extsz=4096 blocks=0, rtextents=0
\nCreate a folder on the host which will be mapped to this storage:<\/p>\n

[root@slave ~]# mkdir \/snookicoco
\nIn order to edit the fstab, we will need to obtain the UUID of the volume. The UUID can be easily obtained via the blkid command.<\/p>\n

[root@slave ~]# blkid
\n\/dev\/sda1: UUID=”46814065-a338-4860-a3f8-781b132987c6″ TYPE=”xfs”
\n\/dev\/sda2: UUID=”3gzDCV-lPFf-8hKA-Kojk-XI01-T7SR-xfK8fd” TYPE=”LVM2_member”
\n\/dev\/sdb1: UUID=”QCrBPH-KPEw-PZ3c-xDs0-nUVE-esuL-AZorqV” TYPE=”LVM2_member”
\n\/dev\/mapper\/rhel-root: UUID=”dddea344-415f-4b2b-811f-8d7eac492f9e” TYPE=”xfs”
\n\/dev\/mapper\/rhel-swap: UUID=”e7128c41-27b0-45ad-8f20-ddf7ce444aa1″ TYPE=”swap”
\n\/dev\/mapper\/roldy-snookicoco: UUID=”ae3cc85c-158f-4075-9025-5db0998c1d73″ TYPE=”xfs”
\nIt\u2019s now time to mount the partition using the fstab.<\/p>\n

[root@slave ~]# vi \/etc\/fstab
\nCopy the UUID across to a new line in the fstab, add the local mount point and specify the file system as per the below entry:<\/p>\n

# \/etc\/fstab
\n# Created by anaconda on Thu Sep 18 00:41:01 2014
\n#
\n# Accessible filesystems, by reference, are maintained under ‘\/dev\/disk’
\n# See man pages fstab(5), findfs(8), mount(8) and\/or blkid(8) for more info
\n#
\n\/dev\/mapper\/rhel-root \/ xfs defaults 1 1
\nUUID=46814065-a338-4860-a3f8-781b132987c6 \/boot xfs defaults 1 2
\n\/dev\/mapper\/rhel-swap swap swap defaults 0 0
\nUUID=”ae3cc85c-158f-4075-9025-5db0998c1d73″ \/snookicoco xfs defaults 1 2
\n~
\n~
\nVerify that the mount point is now listed.<\/p>\n

[root@slave ~]# df -hk | grep snookicoco
\n\/dev\/mapper\/roldy-snookicoco 201388 10400 190988 6% \/snookicoco
\nHow to extend a logical volume<\/p>\n

Extending logical volumes is possible thanks to the lvextend utility.<\/p>\n

lvextend -L +500M \/dev\/coco\/chops<\/p>\n","protected":false},"excerpt":{"rendered":"

HOW TO CREATE LVM USING PVCREATE, VGCREATE, LVCREATE, AND LVEXTEND COMMANDS<\/p>\n

What is LVM?<\/p>\n

LVM is a tool for logical volume management which includes allocating disks, striping, mirroring and resizing logical volumes. With LVM, a hard drive or set of hard drives is allocated to one or more physical volumes.<\/p>\n

How to setup LVM in […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[73],"tags":[],"_links":{"self":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/6103"}],"collection":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6103"}],"version-history":[{"count":1,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/6103\/revisions"}],"predecessor-version":[{"id":6104,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/6103\/revisions\/6104"}],"wp:attachment":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6103"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6103"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6103"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}