How can I create one large partiton over two drives in CentOS?
You need to use LVM (Logical Volume Manager)
First of all , you must be aware that if any of the physical disk fail , the Big 4TB volume will fail too. Backup your data first!
Basically , all you need to do is to partition your data (/dev/sda2 and /dev/sdb1) partition in lvm format then :
- create two physical volumes (
pvcreate /dev/sda2 /dev/sdb1
) - create one volume group with the two physical volumes (
vgcreate VG_DATA /dev/sda2 /dev/sdb1
) - create one logical volume (
lvcreate -l 100%FREE -n DATA VG_DATA
) - create the filesystem on your new volume (
mkfs.ext3 /dev/VG_DATA/DATA
) - mount the volume (
mount /dev/VG_DATA/DATA /data
)
There are dozen of sites with howtos lvm like this one.
Lvm is a lot more than these 4 commands , read the fine manual if you want advanced configuration. I hope it will help you