{"id":362,"date":"2012-06-19T16:23:47","date_gmt":"2012-06-19T08:23:47","guid":{"rendered":"http:\/\/rmohan.com\/?p=362"},"modified":"2012-06-19T16:23:47","modified_gmt":"2012-06-19T08:23:47","slug":"lvm","status":"publish","type":"post","link":"https:\/\/mohan.sg\/?p=362","title":{"rendered":"LVM"},"content":{"rendered":"

LVM<\/strong><\/p>\n

First LVM Setup<\/p>\n

1) fdisk \/dev\/sdb<\/p>\n

WARNING: DOS-compatible mode is deprecated. It’s strongly recommended to
\n switch off the mode (command ‘c’) and change display units to
\n sectors (command ‘u’).<\/p>\n

Command (m for help): n
\nCommand action
\n e extended
\n p primary partition (1-4)
\np
\nPartition number (1-4): 1
\nFirst cylinder (1-13054, default 1):
\nUsing default value 1
\nLast cylinder, +cylinders or +size{K,M,G} (1-13054, default 13054):
\nUsing default value 13054<\/p>\n

Command (m for help): t
\nSelected partition 1
\nHex code (type L to list codes): 8e
\nChanged system type of partition 1 to 8e (Linux LVM)<\/p>\n

Command (m for help): w
\nThe partition table has been altered!<\/p>\n

Calling ioctl() to re-read partition table.
\nSyncing disks.<\/p>\n

fdisk \/dev\/sdc<\/p>\n

fdisk \/dev\/sdd<\/p>\n

fdisk \/dev\/sde<\/p>\n

2) Now we prepare our new partitions for LVM:<\/p>\n

[root@localhost ~]# pvcreate \/dev\/sdb1 \/dev\/sdc1 \/dev\/sdd1
\n Writing physical volume data to disk “\/dev\/sdb1”
\n Physical volume “\/dev\/sdb1” successfully created
\n Writing physical volume data to disk “\/dev\/sdc1”
\n Physical volume “\/dev\/sdc1” successfully created
\n Writing physical volume data to disk “\/dev\/sdd1”
\n Physical volume “\/dev\/sdd1” successfully created<\/p>\n

Revert this last action <\/p>\n

[root@localhost ~]# pvremove \/dev\/sdb1 \/dev\/sdc1 \/dev\/sdd1
\n Labels on physical volume “\/dev\/sdb1” successfully wiped
\n Labels on physical volume “\/dev\/sdc1” successfully wiped
\n Labels on physical volume “\/dev\/sdd1” successfully wiped<\/p>\n

To create again <\/p>\n

pvcreate \/dev\/sdb1 \/dev\/sdc1 \/dev\/sdd1<\/p>\n

[root@localhost ~]# pvcreate \/dev\/sdb1 \/dev\/sdc1 \/dev\/sdd1
\n Writing physical volume data to disk “\/dev\/sdb1”
\n Physical volume “\/dev\/sdb1” successfully created
\n Writing physical volume data to disk “\/dev\/sdc1”
\n Physical volume “\/dev\/sdc1” successfully created
\n Writing physical volume data to disk “\/dev\/sdd1”
\n Physical volume “\/dev\/sdd1” successfully created<\/p>\n

Let dispay the current physical volumes <\/p>\n

[root@localhost ~]# pvdisplay <\/p>\n

3 ) create our volume group datashare <\/p>\n

vgcreate datashare \/dev\/sdb1 \/dev\/sdc1 \/dev\/sdd1 <\/p>\n

[root@localhost ~]# vgcreate datashare \/dev\/sdb1 \/dev\/sdc1 \/dev\/sdd1
\n Volume group “datashare” successfully created<\/p>\n

Dispaly the volume groups
\nvolume groups: [root@localhost ~]# vgdisplay<\/p>\n

Dispaly the volume groups <\/p>\n

[root@localhost ~]# vgscan
\n Reading all physical volumes. This may take a while…
\n Found volume group “datashare” using metadata type lvm2
\n Found volume group “VolGroup” using metadata type lvm2<\/p>\n

let’s rename our volumegroup datashare into fileshare:<\/p>\n

vgrename datashare fileshare<\/p>\n

[root@localhost ~]# vgrename datashare fileshare
\n Volume group “datashare” successfully renamed to “fileshare”<\/p>\n

[root@localhost ~]# vgscan
\n Reading all physical volumes. This may take a while…
\n Found volume group “fileshare” using metadata type lvm2
\n Found volume group “VolGroup” using metadata type lvm2<\/p>\n

let’s delete our volume group fileshare<\/p>\n

vgremove fileshare<\/p>\n

[root@localhost ~]# vgremove fileshare
\n Volume group “fileshare” successfully removed<\/p>\n

[root@localhost ~]# vgcreate datashare \/dev\/sdb1 \/dev\/sdc1 \/dev\/sdd1
\n Volume group “datashare” successfully created<\/p>\n

4) Next we create our logical volumes storage (40GB), backup (5GB), and data (1GB) in the volume group datashare<\/p>\n

lvcreate –name storage –size 30G datashare<\/p>\n

lvcreate –name backup –size 20G datashare<\/p>\n

lvcreate –name data –size 10G datashare<\/p>\n

[root@localhost ~]# lvcreate –name storage –size 30G datashare
\n Logical volume “storage” created
\n[root@localhost ~]# lvcreate –name backup –size 20G datashare
\n Logical volume “backup” created
\n[root@localhost ~]# lvcreate –name data –size 10G datashare
\n Logical volume “data” created<\/p>\n

check using command : lvdisplay <\/p>\n

[root@localhost ~]# lvdisplay
\n\/dev\/datashare\/storage
\n\/dev\/datashare\/backup
\n\/dev\/datashare\/data<\/p>\n

[root@localhost ~]# lvscan
\n ACTIVE ‘\/dev\/datashare\/storage’ [30.00 GiB] inherit
\n ACTIVE ‘\/dev\/datashare\/backup’ [20.00 GiB] inherit
\n ACTIVE ‘\/dev\/datashare\/data’ [10.00 GiB] inherit
\n ACTIVE ‘\/dev\/VolGroup\/lv_root’ [48.62 GiB] inherit
\n ACTIVE ‘\/dev\/VolGroup\/lv_home’ [50.63 GiB] inherit
\n ACTIVE ‘\/dev\/VolGroup\/lv_swap’ [1.97 GiB] inherit<\/p>\n

5) Next let’s delete the logical volume data <\/p>\n

lvremove \/dev\/datashare\/data<\/p>\n

[root@localhost ~]# lvremove \/dev\/datashare\/data
\nDo you really want to remove active logical volume data? [y\/n]: y
\n Logical volume “data” successfully removed<\/p>\n

Now let create logical volume servershare <\/p>\n

lvcreate –name servershare –size 5G datashare<\/p>\n

[root@localhost ~]# lvcreate –name servershare –size 5G datashare
\n Logical volume “servershare” created<\/p>\n

Now let’s enlarge servershare to 10 G <\/p>\n

lvextend -L10G \/dev\/datashare\/servershare<\/p>\n

root@localhost ~]# lvextend -L10G \/dev\/datashare\/servershare
\n Extending logical volume servershare to 10.00 GiB
\n Logical volume servershare successfully resized<\/p>\n

Let’s shrink it to 5GB Again <\/p>\n

lvreduce -L5G \/dev\/datashare\/servershare<\/p>\n

root@localhost ~]# lvreduce -L5G \/dev\/datashare\/servershare
\n WARNING: Reducing active logical volume to 5.00 GiB
\n THIS MAY DESTROY YOUR DATA (filesystem etc.)
\nDo you really want to reduce servershare? [y\/n]: Y
\n Reducing logical volume servershare to 5.00 GiB
\n Logical volume servershare successfully resized<\/p>\n

6) Lets format and mount the partition <\/p>\n

[root@localhost ~]# mkfs.ext4 \/dev\/datashare\/storage
\nmke2fs 1.41.12 (17-May-2010)
\nFilesystem label=
\nOS type: Linux
\nBlock size=4096 (log=2)
\nFragment size=4096 (log=2)
\nStride=0 blocks, Stripe width=0 blocks
\n1966080 inodes, 7864320 blocks
\n393216 blocks (5.00%) reserved for the super user
\nFirst data block=0
\nMaximum filesystem blocks=0
\n240 block groups
\n32768 blocks per group, 32768 fragments per group
\n8192 inodes per group
\nSuperblock backups stored on blocks:
\n 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
\n 4096000<\/p>\n

Writing inode tables: done
\nCreating journal (32768 blocks): done
\nWriting superblocks and filesystem accounting information: done<\/p>\n

This filesystem will be automatically checked every 26 mounts or
\n180 days, whichever comes first. Use tune2fs -c or -i to override.<\/p>\n

same case<\/p>\n

mkfs.ext4 \/dev\/datashare\/backup
\nmkfs.ext4 \/dev\/datashare\/servershare<\/p>\n

7) mkdir storage backup servershare in \/ <\/p>\n

mount the logical volumes<\/p>\n

mount \/dev\/datashare\/backup \/backup
\n mount \/dev\/datashare\/servershare \/servershare
\n mount \/dev\/datashare\/storage \/storage<\/p>\n

[root@localhost \/]# df -TH
\nFilesystem Type Size Used Avail Use% Mounted on
\n\/dev\/mapper\/VolGroup-lv_root
\n ext4 52G 2.6G 47G 6% \/
\ntmpfs tmpfs 528M 0 528M 0% \/dev\/shm
\n\/dev\/sda1 ext4 508M 32M 450M 7% \/boot
\n\/dev\/mapper\/VolGroup-lv_home
\n ext4 54G 189M 51G 1% \/home
\n\/dev\/mapper\/datashare-backup
\n ext4 22G 181M 20G 1% \/backup
\n\/dev\/mapper\/datashare-servershare
\n ext4 5.3G 145M 4.9G 3% \/servershare
\n\/dev\/mapper\/datashare-storage
\n ext4 32G 181M 30G 1% \/storage<\/p>\n

Add in the fstab to in order mount after the reboot <\/p>\n

8) Resize Logical Volumes And Their Filesystems<\/p>\n

Now let’s enlarge share from 30GB to 40GB:<\/p>\n

[root@localhost \/]# lvextend -L50G \/dev\/datashare\/storage
\n Extending logical volume storage to 50.00 GiB
\n Logical volume storage successfully resized<\/p>\n

we have enlarged only storage, but not the ext4 filesystem on share. <\/p>\n

we can do it by <\/p>\n

[root@localhost \/]# e2fsck -f \/dev\/datashare\/storage
\ne2fsck 1.41.12 (17-May-2010)
\nPass 1: Checking inodes, blocks, and sizes
\nPass 2: Checking directory structure
\nPass 3: Checking directory connectivity
\nPass 4: Checking reference counts
\nPass 5: Checking group summary information
\n\/dev\/datashare\/storage: 11\/1966080 files (0.0% non-contiguous), 167409\/7864320 blocks<\/p>\n

Make a note of the total amount of blocks (7864320) we need it when we shrink storage later on.
\n[root@localhost \/]# resize2fs \/dev\/datashare\/storage
\nresize2fs 1.41.12 (17-May-2010)
\nResizing the filesystem on \/dev\/datashare\/storage to 13107200 (4k) blocks.
\nThe filesystem on \/dev\/datashare\/storage is now 13107200 blocks long.<\/p>\n

Let is mount we will have 50 GB <\/p>\n

[root@localhost \/]# mount \/dev\/datashare\/storage \/storage\/<\/p>\n

[root@localhost \/]# df -TH
\nFilesystem Type Size Used Avail Use% Mounted on
\n\/dev\/mapper\/VolGroup-lv_root
\n ext4 52G 2.6G 47G 6% \/
\ntmpfs tmpfs 528M 0 528M 0% \/dev\/shm
\n\/dev\/sda1 ext4 508M 32M 450M 7% \/boot
\n\/dev\/mapper\/VolGroup-lv_home
\n ext4 54G 189M 51G 1% \/home
\n\/dev\/mapper\/datashare-backup
\n ext4 22G 181M 20G 1% \/backup
\n\/dev\/mapper\/datashare-servershare
\n ext4 5.3G 145M 4.9G 3% \/servershare
\n\/dev\/mapper\/datashare-storage
\n ext4 53G 189M 50G 1% \/storage<\/p>\n

Lets is Umount the backup and reduce the disk space 14G<\/p>\n

umount \/backup\/<\/p>\n

\/dev\/mapper\/datashare-backup<\/p>\n

e2fsck -f \/dev\/datashare\/backup<\/p>\n

root@localhost \/]# e2fsck -f \/dev\/datashare\/backup
\ne2fsck 1.41.12 (17-May-2010)
\nPass 1: Checking inodes, blocks, and sizes
\nPass 2: Checking directory structure
\nPass 3: Checking directory connectivity
\nPass 4: Checking reference counts
\nPass 5: Checking group summary information
\n\/dev\/datashare\/backup: 11\/1310720 files (0.0% non-contiguous), 126289\/5242880 blocks<\/p>\n

[root@localhost \/]# resize2fs \/dev\/datashare\/backup 3242880
\nresize2fs 1.41.12 (17-May-2010)
\nResizing the filesystem on \/dev\/datashare\/backup to 3242880 (4k) blocks.
\nThe filesystem on \/dev\/datashare\/backup is now 3242880 blocks long.<\/p>\n

[root@localhost \/]# lvreduce -L14G \/dev\/datashare\/backup
\n WARNING: Reducing active logical volume to 14.00 GiB
\n THIS MAY DESTROY YOUR DATA (filesystem etc.)
\nDo you really want to reduce backup? [y\/n]: y
\n Reducing logical volume backup to 15.00 GiB
\n Logical volume backup successfully resized
\n[root@localhost \/]# mount \/dev\/datashare\/backup \/backup\/
\n[root@localhost \/]# df -TH
\nFilesystem Type Size Used Avail Use% Mounted on
\n\/dev\/mapper\/VolGroup-lv_root
\n ext4 52G 2.6G 47G 6% \/
\ntmpfs tmpfs 528M 0 528M 0% \/dev\/shm
\n\/dev\/sda1 ext4 508M 32M 450M 7% \/boot
\n\/dev\/mapper\/VolGroup-lv_home
\n ext4 54G 189M 51G 1% \/home
\n\/dev\/mapper\/datashare-servershare
\n ext4 5.3G 145M 4.9G 3% \/servershare
\n\/dev\/mapper\/datashare-storage
\n ext4 53G 189M 50G 1% \/storage
\n\/dev\/mapper\/datashare-backup
\n ext4 14G 177M 13G 2% \/backup<\/p>\n","protected":false},"excerpt":{"rendered":"

LVM<\/p>\n

First LVM Setup<\/p>\n

1) fdisk \/dev\/sdb<\/p>\n

WARNING: DOS-compatible mode is deprecated. It’s strongly recommended to switch off the mode (command ‘c’) and change display units to sectors (command ‘u’).<\/p>\n

Command (m for help): n Command action e extended p primary partition (1-4) p Partition number (1-4): 1 First cylinder (1-13054, default 1): Using default […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"_links":{"self":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/362"}],"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=362"}],"version-history":[{"count":1,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/362\/revisions"}],"predecessor-version":[{"id":363,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/362\/revisions\/363"}],"wp:attachment":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=362"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=362"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=362"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}