I am seeing the above message in logs. Some times the system locks up, some times it continues. The OS resides on the RAID array, so if the controller goes offline, the system cannot continue running. Any ideas what might be causing this? I am running a RedHat AMD64 system, with kernel: 2.6.9-34.EL and aacraid module version 1.1-5[2425]. More info: # grep aac /var/log/dmesg Adaptec aacraid driver (1.1-5[2425]) aacraid0: kernel 5.1-0[9117] aacraid0: monitor 5.1-0[9117] aacraid0: bios 5.1-0[9117] aacraid0: serial 504e8b scsi0 : aacraid Does anyone have any suggestions? The system has hung twice within the space of 2 hours, so this is not good! Regards, Simon - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html