In this post, i will share on how to setup additional LVM in CentOS 5.5.
1. Assumed that new hard disk 2 (sdb) has been added in this CentOS 5.5 server.
2. Print the current partition table of the hard disk :
[root@server ~]# fdisk -lu Disk /dev/sda: 21.4 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders, total 41943040 sectors Units = sectors of 1 * 512 = 512 bytes Device Boot Start End Blocks Id System /dev/sda1 * 63 208844 104391 83 Linux /dev/sda2 208845 2313359 1052257+ 82 Linux swap / Solaris /dev/sda3 2313360 14667344 6176992+ 8e Linux LVM /dev/sda4 14667345 41929649 13631152+ 8e Linux LVM Disk /dev/sdb: 21.4 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders, total 41943040 sectors Units = sectors of 1 * 512 = 512 bytes Disk /dev/sdb doesn't contain a valid partition table
3. Create new partition for /dev/sdb using below command.
[root@server ~]# fdisk /dev/sdb Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel Building a new DOS disklabel. Changes will remain in memory only, until you decide to write them. After that, of course, the previous content won't be recoverable. The number of cylinders for this disk is set to 2610. There is nothing wrong with that, but this is larger than 1024, and could in certain setups cause problems with: 1) software that runs at boot time (e.g., old versions of LILO) 2) booting and partitioning software from other OSs (e.g., DOS FDISK, OS/2 FDISK) Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite) Command (m for help): n Command action e extended p primary partition (1-4) p Partition number (1-4): 1 First cylinder (1-2610, default 1): Using default value 1 Last cylinder or +size or +sizeM or +sizeK (1-2610, default 2610): Using default value 2610 Command (m for help): t Selected partition 1 Hex code (type L to list codes): 8e Changed system type of partition 1 to 8e (Linux LVM) Command (m for help): p Disk /dev/sdb: 21.4 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 1 2610 20964793+ 8e Linux LVM Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks.
[root@server ~]# mke2fs -j /dev/sdb1
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
2621440 inodes, 5241198 blocks
262059 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=0
160 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 24 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
4. Next create the new partitions for this LVM.
[root@server ~]# pvcreate /dev/sdb1 Physical volume "/dev/sdb1" successfully created
5. Display the Physical Volume using command below:
[root@server ~]# pvdisplay --- Physical volume --- PV Name /dev/sda4 VG Name VolGroup00 PV Size 13.00 GB / not usable 3.67 MB Allocatable yes (but full) PE Size (KByte) 4096 Total PE 3327 Free PE 0 Allocated PE 3327 PV UUID JgYuxF-UJiB-t148-g5WQ-Lx05-Ozk1-13UwAR "/dev/sdb1" is a new physical volume of "19.99 GB" --- NEW Physical volume --- PV Name /dev/sdb1 VG Name PV Size 19.99 GB Allocatable NO PE Size (KByte) 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID 246F8V-FMTR-WNK0-9305-q2sf-PKtC-VQXOQr
6. Create new volume group for /dev/sdb1. Assumed that previous volume goup is VolGroup00. So next volume group will be VolGroup01.
[root@server ~]# vgcreate VolGroup01 /dev/sdb1 Volume group "VolGroup01" successfully created
7. Display the existing Volume Group.
[root@server ~]# vgdisplay --- Volume group --- VG Name VolGroup01 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 1 VG Access read/write VG Status resizable MAX LV 0 Cur LV 0 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size 19.99 GB PE Size 4.00 MB Total PE 5118 Alloc PE / Size 0 / 0 Free PE / Size 5118 / 19.99 GB VG UUID tvLVhu-6Nzo-jB0b-oZQ4-VY30-9TP4-Dhxvvm --- Volume group --- VG Name VolGroup00 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 2 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 1 Max PV 0 Cur PV 1 Act PV 1 VG Size 13.00 GB PE Size 4.00 MB Total PE 3327 Alloc PE / Size 3327 / 13.00 GB Free PE / Size 0 / 0 VG UUID 3XozzT-3A3w-6eXs-XoEb-yRN1-v9FM-N0YheL
8. Create logical volumes with the name of optvol into VolGroup01 volume group.
[root@server ~]# lvcreate --name optvol -l 100%FREE VolGroup01 Logical volume "optvol" created
9. Display the logical volumes.
[root@server ~]# lvdisplay --- Logical volume --- LV Name /dev/VolGroup01/optvol VG Name VolGroup01 LV UUID YXkMnR-l7gH-tj0r-dCUt-Ncl7-aTmb-Vas4Tp LV Write Access read/write LV Status available # open 0 LV Size 19.99 GB Current LE 5118 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1 --- Logical volume --- LV Name /dev/VolGroup00/datavol VG Name VolGroup00 LV UUID KowzAO-WWMj-O0xw-IY31-Gfqv-sjaE-nYvdhk LV Write Access read/write LV Status available # open 1 LV Size 13.00 GB Current LE 3327 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0
10. creating a file with the mke2fs command
[root@server ~]# mke2fs -j /dev/VolGroup01/optvol
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
2621440 inodes, 5240832 blocks
262041 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=0
160 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 38 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@server ~]# e2label /dev/VolGroup01/optvol /opt
[root@server ~]# vi /etc/fstab
[root@server ~]# mount /opt
[root@server ~]# df -lh
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 5.8G 4.3G 1.2G 79% /
/dev/sda1 99M 12M 83M 13% /boot
tmpfs 506M 0 506M 0% /dev/shm
/dev/mapper/VolGroup00-datavol
13G 855M 12G 7% /data
/dev/mapper/VolGroup01-optvol
20G 173M 19G 1% /opt
[root@server ~]# fdisk -lu Disk /dev/sda: 21.4 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders, total 41943040 sectors Units = sectors of 1 * 512 = 512 bytes Device Boot Start End Blocks Id System /dev/sda1 * 63 208844 104391 83 Linux /dev/sda2 208845 2313359 1052257+ 82 Linux swap / Solaris /dev/sda3 2313360 14667344 6176992+ 8e Linux LVM /dev/sda4 14667345 41929649 13631152+ 8e Linux LVM Disk /dev/sdb: 21.4 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders, total 41943040 sectors Units = sectors of 1 * 512 = 512 bytes Device Boot Start End Blocks Id System /dev/sdb1 63 41929649 20964793+ 8e Linux LVM
References:
https://wiki.archlinux.org/index.php/LVM http://vr.org/docs/centos/5/html/Cluster_Logical_Volume_Manager/LV_create.html http://serverfault.com/questions/41904/volume-group-out-of-space-how-do-i-reclaim-it http://www.idevelopment.info/data/Unix/Linux/LINUX_ManagingPhysicalLogicalVolumes.shtml http://en.gentoo-wiki.com/wiki/Root_filesystem_over_LVM2,_DM-Crypt_and_RAID http://wingloon.com/2009/01/16/setup-additional-lvm-in-centos-52/ http://rute.2038bug.com/node22.html.gz
