Hardware Raid on Intel DG965OT Motherboard

Antony Mawer fbsd-questions at mawer.org
Wed Apr 4 23:03:00 UTC 2007

On 4/04/2007 9:30 PM, Alexander Anderson wrote:
> I have Intel D975XBX2 with two on-board SATA RAID controllers: one is Intel
> Matrix and the other is Marvell storage. I have FreeBSD 6.2 with RAID-5
> using Intel Matrix Storage. It seems to work fine.
> ad4: 305245MB <Seagate ST3320620AS 3.AAJ> at ata2-master SATA150
> ad6: 305245MB <Seagate ST3320620AS 3.AAJ> at ata3-master SATA150
> ad8: 305245MB <Seagate ST3320620AS 3.AAJ> at ata4-master SATA150
> ad10: 305245MB <Seagate ST3320620AS 3.AAJ> at ata5-master SATA150
> ar0: 915729MB <Intel MatrixRAID RAID5 (stripe 64 KB)> status: READY
> ar0: disk0 READY using ad4 at ata2-master
> ar0: disk1 READY using ad8 at ata4-master
> ar0: disk2 READY using ad6 at ata3-master
> ar0: disk3 READY using ad10 at ata5-master

You may want to re-think that option... according to the ataraid(4) man 
page, RAID5 is not functional (ie. you have about as much data safety as 
a RAID0 stripe set does):

>      RAID5 is not supported at this time.  Code exists, but it neither uses
>      nor maintains parity information.

One drive failure and you will be in for a whole world of hurt...


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