load jumps w/ FC7+SutperTrak EX163000 RAID controller

[LandRover]

Hey,

I'm running fedora core 7 server with kernel 2.6.22.1 (latest stable) with Promise SutperTrak EX163000 RAID controller.

The raid holds 2 sets of Arrays:

2x74GB RAPTOR - RAID1 - OS
8x500GB - RAID5 - STORAGE


The system works fine but stuck sometimes or has a rapid load avg. jumps.
The driver for the controller comes with the kernel (/lib/modules/2.6.22.1-27.fc7/kernel/drivers/scsi/stex.ko) as default.

After checking closely the log I found this:
Jul 22 08:17:35 ftp kernel: stex(0000:06:0e.0): aborting command
Jul 22 08:17:35 ftp kernel: sd 0:0:14:0: [sdb] CDB: Write(10): 2a 00 02 20 23 07 00 00 08 00
Jul 22 08:20:00 ftp kernel: stex(0000:06:0e.0): aborting command
Jul 22 08:20:00 ftp kernel: sd 0:0:14:0: [sdb] CDB: Write(10): 2a 00 02 18 01 37 00 00 10 00
Jul 22 09:17:55 ftp kernel: stex(0000:06:0e.0): aborting command
Jul 22 09:17:55 ftp kernel: sd 0:0:14:0: [sdb] CDB: Write(10): 2a 00 02 23 80 4f 00 00 08 00
Jul 22 10:19:00 ftp kernel: stex(0000:06:0e.0): aborting command
Jul 22 10:19:00 ftp kernel: sd 0:0:0:0: [sda] CDB: Write(10): 2a 00 76 78 00 32 00 00 08 00
Jul 22 10:42:54 ftp kernel: stex(0000:06:0e.0): aborting command
Jul 22 10:42:54 ftp kernel: sd 0:0:0:0: [sda] CDB: Write(10): 2a 00 72 e0 00 32 00 00 08 00
Jul 22 12:17:44 ftp kernel: stex(0000:06:0e.0): aborting command
Jul 22 12:17:44 ftp kernel: sd 0:0:14:0: [sdb] CDB: Write(10): 2a 00 02 24 60 47 00 00 38 00
Jul 22 12:17:44 ftp kernel: stex(0000:06:0e.0): aborting command
Jul 22 12:17:44 ftp kernel: sd 0:0:14:0: [sdb] CDB: Write(10): 2a 00 02 23 43 ff 00 00 10 00

Each line here resulted in HUGE load avg. spike, above 100!

I'm 100% sure it has something to do with the controller.
Any possible solution?

Regards,
Oleg G.