Our HP Proliant ML150 is configured as RAID in the BIOS, and created a "Logical drive" (using two 250GB HD) as RAID 1+0.
The procedure seems to be Ok.
However, when installing the OS (Ubuntu 10.10) the partitioner utility still shows our two HD
/dev/sda
/dev/sdb
I was expecting to see only one drive, since the two HD are RAIDed.
Is there a special step missing (checked again at boot, the RAID logical drive is still alive)?
edit It seems Ubuntu does not recognize the logical RAID drive.
edit2 RAID 1+0 is possible with two disks. See this Wikipedia page.
RAID 1+0: mirrored sets in a striped set (minimum two disks but more commonly four disks to take advantage of speed benefits; even number of disks)
Best Answer
Either get a hardware RAID controller like a SmartArray P4xx or use software RAID. SW RAID works well on Linux - much better than Windows - so you may not need HW RAID.
The main advantage of HW RAID is battery backup which gives you a fairly good chance of surviving a power outage without corrupting your disk. You might find it worth your while to get a HW RAID controller for this reason.