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The RAID is out only "hard disk". So some part of it is reserved for boot, but rest of the partitions are on LVM so that we can adjust the sizes as needed later on.
No, the hard disks seem fine.
I have situation which is completely different, uses different hardware and disks, but the same effect as you: Write access to my RAID array is about 2mb/s, sequential reads 22mb/s, random reads about 11-12 mb/s.
I'm using SuSE 9.2 pro with a Compaq SmartArray 2P / 3200 SCSI RAID controller and a stack of 8 SCSI drives, 18 GB 10,000 RPM. I boot from a separate IDE drive. The raid array is set up as three ReiserFS filesystems each in its own logical volume.
I can't explain it.
Are you using the SA controller in a Compaq box? If not, there's your problem when writing to disk. Reads are generally fine, but writes are disasters in that config. Anders.