Partitioning using LVM
8:10 PM
In viewing the image from above you can see that you can join 1 or more physical volumes into 1 and utilize them all, you would just need to create the Volume Group (VG).
Once you create the VG using the 'vgcreate' command i.e. #vgcreate [name of VG] [name of PV 1] [name of PV 2] and so on . In the below example the VG was created with #vgcreate vg_root /dev/sda3
[root@host ~]# pvdisplay --- Physical volume --- PV Name /dev/sda3 VG Name vg_root PV Size 102.63 GB / not usable 9.10 MB Allocatable yes (but full) PE Size (KByte) 32768 Total PE 3284 Free PE 0 Allocated PE 3284 PV UUID ehSD7G-Qrr9-OFGv-QGuO-P0Cb-E6zz-gUcqdK [root@host ~]#
[root@host ~]# vgdisplay --- Volume group --- VG Name vg_root System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 7 VG Access read/write VG Status resizable MAX LV 0 Cur LV 4 Open LV 4 Max PV 0 Cur PV 1 Act PV 1 VG Size 102.62 GB PE Size 32.00 MB Total PE 3284 Alloc PE / Size 3284 / 102.62 GB Free PE / Size 0 / 0 VG UUID DrefQc-0x9P-zlBW-ZoeL-Kpmd-0EzG-dPuOxC [root@host ~]#
Now, you can separate into however many Logical Volumes you want and whatever sizes you want them to be so long as its within the VG size.
The 'lvcreate' command will be used to create the Logical Volume (LV). i.e. 'lvcreate -n (new LV) [name of the VG] [name of the LV] -L (dictating size) size of the new LV
[root@host ~]#lvcreate -n /dev/vg_root/lv_u01 -L 20Gt
You can then see the new LV you created by using the 'lvdisplay' command:
[root@host ~]# lvdisplay --- Logical volume --- LV Name /dev/vg_root/lv_root VG Name vg_root LV UUID 7oCKvj-Pw3i-tlJA-CMyM-tkVm-elRm-Cf2pgg LV Write Access read/write LV Status available # open 1 LV Size 30.00 GB Current LE 960 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 --- Logical volume --- LV Name /dev/vg_root/lv_swap VG Name vg_root LV UUID LNohp8-n18L-wUdc-iNNn-6bZw-dopK-83BBVz LV Write Access read/write LV Status available # open 1 LV Size 16.00 GB Current LE 512 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1 --- Logical volume --- LV Name /dev/vg_root/lv_u01 VG Name vg_root LV UUID enujuK-d98s-RwyZ-WUew-bkQU-4wkb-UQkcFj LV Write Access read/write LV Status available # open 1 LV Size 20.00 GB Current LE 640 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:2
[root@host ~]# mkfs.ext3 -m 1 /dev/vg_root/lv_u01 (use -m 1 to reduce the reserved-blocks-percentage from 5% to 1% for max space for application) [root@host ~]# mkdir /u01 [root@host ~]# mount /dev/vg_root/lv_u01 /u01 [root@host ~]# vi /etc/fstab
[root@host ~]# cat /etc/fstab /dev/vg_root/lv_root / ext3 defaults 1 1 LABEL=/boot /boot ext3 defaults 1 2 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 /dev/vg_root/lv_u01 /u01 ext3 defaults 0 0 /dev/vg_root/lv_u02 /u02 ext3 defaults 0 0 proc /proc proc defaults 0 0 /dev/vg_root/lv_swap swap swap defaults 0 0
Red_Hat_Enterprise_Linux-5-Logical_Volume_Manager_Administration-en-US.pdf
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