The usual cause for this is that the bus, or the drives, are in trouble. The driver and the OS are merely responding to a serious hardware failure. My first suggestion is to ensure that you have the latest available firmware in the controller and in the drives. Problems crop up if the power supplies are not capable of dealing with the load, make sure you have adequate power budget for all peak power consumption requirements. If drive compatibility is in question, then I suggest contacting the drive vendor, and Adaptec Technical support to determine if there is an issue. Possibilities include utilizing the WD JD series drives, as they are not compatible with any Hardware RAID cards. WD has a program where they will replace your drives with RAID compatible units. Check SATA/SAS cables and routing as well as cooling for both the drives and the controller card. Sincerely -- Mark Salyzyn > -----Original Message----- > From: linux-scsi-owner@xxxxxxxxxxxxxxx > [mailto:linux-scsi-owner@xxxxxxxxxxxxxxx] On Behalf Of Simon Matthews > Sent: Friday, October 06, 2006 5:23 PM > To: linux-scsi@xxxxxxxxxxxxxxx > Subject: aacraid: Host adapter reset request. SCSI hang ? > Adaptec 2820SA > > > 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 > - 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
