1.Rescan SCSI Bus to detect newly added disk using below command.
[root@RHEL ~]# echo "- - -">/sys/class/scsi_host/host*/scan
2. Tail system message file for checking the newly added disk is probed.
[root@RHEL ~]# tail -f /var/log/messages
Mar 6 16:34:56 RHEL kernel: SCSI device sdc: 545259520 512-byte hdwr sectors (279173 MB)
Mar 6 16:34:56 RHEL kernel: sdc: cache data unavailable
Mar 6 16:34:56 RHEL kernel: sdc: assuming drive cache: write through
Mar 6 16:34:56 RHEL kernel: SCSI device sdc: 545259520 512-byte hdwr sectors (279173 MB)
Mar 6 16:34:56 RHEL kernel: sdc: cache data unavailable
Mar 6 16:34:56 RHEL kernel: sdc: assuming drive cache: write through
Mar 6 16:34:57 RHEL kernel: sdc: unknown partition table
Mar 6 16:34:57 RHEL kernel: Attached scsi disk sdc at scsi0, channel 0, id 2, lun 0
Mar 6 16:34:57 RHEL scsi.agent[31318]: disk at /devices/pci0000:00/0000:00:10.0/host0/target0:0:2/0:0:2:0
Mar 6 16:34:57 RHEL udevd[1418]: udev done!
3. Now the new disk (/dev/sdc) is visible in fdisk output (With a invalid disk label for new disks)
[root@RHEL ~]# fdisk -l
Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 3916 31350847+ 8e Linux LVM
Disk /dev/sdb: 75.1 GB, 75161927680 bytes
255 heads, 63 sectors/track, 9137 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 9138 73400319+ 8e Linux LVM
Disk /dev/sdc: 279.1 GB, 279172874240 bytes
255 heads, 63 sectors/track, 33940 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/sdc doesn't contain a valid partition table
4. Create physical volume on new disk
#pvcreate /dev/sdc
5. Extend the VG(VgBSL) to new disk (/dev/sdc)
[root@RHEL ~]# vgextend VgBSL /dev/sdc
/dev/cdrom: open failed: No medium found
Volume group "VgBSL" successfully extended
5. List the existing Physical Volumes
[root@RHEL ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 VolGroup00 lvm2 a- 29.88G 0
/dev/sdb1 VgBSL lvm2 a- 69.97G 1.53G
/dev/sdc VgBSL lvm2 a- 259.97G 259.97G
6. Extend logical Volume to new size (old size + newly available)
[root@RHEL ~]# lvextend -L 299G /dev/mapper/VgBSL-LogVol02
Extending logical volume LogVol02 to 299.00 GB
Logical volume LogVol02 successfully resized
7. Extend the Volume using ext2online command.
[root@RHEL ~]# ext2online /dev/mapper/VgBSL-LogVol02
ext2online v1.1.18 - 2001/03/18 for EXT2FS 0.5b
8. Now the Volume is resized to new size
[root@RHEL ~]# df -h /apps
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VgBSL-LogVol02
295G 37G 247G 13% /apps
