Check if you can find the for newly added HDD:
ls /dev/sd*
or use:
fdisk -l
If you cannot find your device force a rescan with:
echo "- - -" > /sys/class/scsi_host/host0/scan echo "- - -" > /sys/class/scsi_host/host1/scan echo "- - -" > /sys/class/scsi_host/host2/scan
Now you should see a new device, with:
ls /dev/sd*
or:
fdisk -l
Let’s presume its sdc, meaning it’s the 3th scsi/sata/sas drive added to this system.
Create a new partition using fdisk:
fdisk /dev/sdc
while in fdisk use these commands to create a new primary partition that is of LVM type:
n (new partition) p (primary partition) 1 (partition number: 1) just press enter (leave default for first cylinder) just press enter (leave default for last cylinder) t (change partition's type) 8e (Linux LVM) w (write changes to disk)
probe for the newly created partition:
partprobe /dev/sdc
Extend volume group to use the new partition:
vgextend vg_volumegroupname /dev/sdc1
Extend an existing logical volume:
Note:
- I will assume that you already have a Volume Group set up with the name vg_volumegroupname. Usually on CentOS default installs the name of the Volume Group is identical to the system name, but you can always check it with fdisk -l.
- I will assume that you want to create a Logical Volume named lv_logicalvolumename, for this documentations purposes; you are of course encouraged to change that value to your liking.
lvextend -l +100%FREE /dev/vg_volumegroupname/lv_logicalvolumename
or create a new one:
lvcreate -l 100%FREE --name lv_logicalvolumename vg_volumegroupname
check if everything went ok:
pvdisplay
resize file system (for existing logical volume)
resize2fs /dev/vg_volumegroupname/lv_logicalvolumename
or create file system (for new logical volume):
mkfs.ext4 /dev/vg_volumegroupname/lv_logicalvolumename
check with:
df -h