I am installing Debian 6 on a server, a HP Proliant DL380 G4. It comes with 6 hard disks. Originally it had Windows server and I could see only see 3 hard disks (the other three said the Admin, were used as RAID 1) , so, now I want to install Debian and curiously when I want to format the disks I cant see the 6, just 3... why is this? do I have to do something special for make it recognize them?
The disks (and RAID arrays) are being managed by the hardware RAID controller in your server. My guess is that the six drives are currently configured as three RAID1 pairs, which is what your OS is seeing. If you truly want to expose all six hard drives to the OS, you will need to go into the RAID controller BIOS and re-configure things.
I would highly recommend, though, letting the hardware RAID controller handle RAID for you. No offense, but judging from your level of familiarity with storage, the hardware RAID controller will likely do a much better job managing things than you will with software RAID.
In all cases, the RAID controller can be configured during the system's POST process. A simple RAID configuration can be performed by pressing
If you intend to reformat this system and install Debian, and you're okay with deleting the old data on the server, you'll want to create a new "Logical Drive" in the BIOS utility.
A typical setup would be all six disks in a single RAID 1+0 or RAID 5 configuration. Follow the on-screen prompts to do this.
The result of a configured logical drive is that the RAID controller will present one logical disk to the operating system. You can carve this into the partitions you need for Linux. In this basic setup, you should not see 2, 3 or 6 disks at the OS level, but rather one target that's a logical representation of the raided disks. The chances are that the device will present itself as