I decided to install ubuntu server 8.10 64bit on a new server (motherboard stated on topic).

I've setup hardware raid 10 using the bios, using 4 disks 500GBytes for the raid and one more the same as a hot spare disk. Summary: 5 disks (4 on raid and 1 hot spare).

The raid is totally about 945 GBytes in size (on bios).

The controller for the raid I used is the onboard Adaptec.

I ended up trying the how to listed here:
https://help.ubuntu.com/community/FakeRaidHowto

and used Method 2.


Using some command with dmraid, I realized that ubuntu sees the array created on the bios, with the name I gave (ddf1_MAIN), but the problem is that instead of the array partition to be about 1TByte (4 disks of 500MBytes in raid 10 as mentioned), is the half (500GBytes).

dmraid -r shows me that all the drives are on the array (ddf1). But I cannot understand why it sees the half of the actual capacity.

dmraid -s shows the type as mirror instead of mirror over stripe as it supposed to be.

Thank you in advance