Hello again! This is an update for those who are interested. I could find a hardware setup whith which the problems don't occur. I exchanged the Supermicro H8SCM-F (AMD Opteron 4170HE) board with one with an Intel CPU. So it might be the chipset or the like. All previous tested HBAs and SATA controller run just fine without any strange messages on the intel based board. The last try with the supermicro board was with an LSI SAS1068E PCI-Express Fusion-MPT SAS HBA. It doesn't crash but did resets on the SATA connection all the time. I could get 5,1MB write speed at most. Best regards Lars -- 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