Comment 6 for bug 618542

I spent some time to review help resources to fix the here mentioned behavior. My server reports he following:
root@server:/var/log# dmesg | grep 3w
[ 4.213891] 3ware 9000 Storage Controller device driver for Linux v2.26.02.012.
[ 4.213918] 3w-9xxx 0000:02:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[ 4.213922] 3w-9xxx 0000:02:00.0: setting latency timer to 64
[ 4.510006] scsi0 : 3ware 9000 Storage Controller
[ 4.510059] 3w-9xxx: scsi0: Found a 3ware 9000 Storage Controller at 0xfe7ff000, IRQ: 16.
[ 4.870010] 3w-9xxx: scsi0: Firmware FE9X 4.10.00.007, BIOS BE9X 4.08.00.002, Ports: 4.
[ 10.428573] 3w-9xxx: scsi0: ERROR: (0x03:0x0101): Invalid command opcode:opcode=0x85.
[ 10.428868] 3w-9xxx: scsi0: ERROR: (0x03:0x0101): Invalid command opcode:opcode=0x85.
[ 10.429118] 3w-9xxx: scsi0: ERROR: (0x03:0x0101): Invalid command opcode:opcode=0x85.
[ 10.505140] 3w-9xxx: scsi0: ERROR: (0x03:0x0101): Invalid command opcode:opcode=0x85.
[ 10.505428] 3w-9xxx: scsi0: ERROR: (0x03:0x0101): Invalid command opcode:opcode=0x85.
[ 10.505704] 3w-9xxx: scsi0: ERROR: (0x03:0x0101): Invalid command opcode:opcode=0x85.
[ 112.502835] 3w-9xxx: scsi0: AEN: INFO (0x04:0x0029): Verify started:unit=0.
[ 853.598715] 3w-9xxx: scsi0: AEN: INFO (0x04:0x002B): Verify completed:unit=0.

As the array crashes multiple times a month, this is very annoying. The server has some constant load, the file system partially under heavy load. RAID5 is equipped with 4x WD WD2002FYPS 2TB disks. I use the latest version of the 10.04 Ubuntu server release, also with the latest kernel release.
Happy to test whatever is available to remediate the situation.
Regards, WolK.