[CentOS] Increase Disk Space with LVM

Felix Kölzow felix.koelzow at gmx.de
Tue Jul 31 11:31:15 UTC 2018


Dear CentOS-Community,

we have a server with four hard drives that are configured as raid10 
(/dev/sda).

Now, /home and /root are almost full. Therefore, we decided to buy four

additional hard drives that should configured also as raid 10 (/dev/sdb).


I want to use LVM to extend disk space for root and home.

My (successful) test procedure in a virtual environment looks like this:


 1. devide /dev/sdb into /dev/sdb1 for root and /dev/sdb2 for home using
    parted
 2. Convert disk to physical volume: pvcreate /dev/sdb1
 3. add physical volume to volume group (called centos): vgextend centos
    /dev/sdb1
 4. Allocate physical volume to a logical volume:lvextend -l +100$FREE
    /dev/centos/root
 5. resize2fs /dev/centos/root or xfs_grows /dev/centos/root depending
    on file system used
 6. repeat steps 2-6 for /home and sdb2


The mentioned instruction I've got from this page:

https://askubuntu.com/questions/458476/adding-disks-with-lvm#459176


Now my question:

Is this procedure really safe or is something missing or are there some 
steps

which I overlooked actually?


Kind Regards

Felix Kölzow




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