Hi, I have a Silicon Image 3114 controller on a dual opteron box with 4 ST3160023AS drives. The root is a software RAID5 with xfs. I have not been able to get 2.6.15 or 2.6.16 to boot on this machine. 2.6.14 boots up just fine. With 2.6.16 the sata probing process is very slow and I get the following output: ata1: SATA link up 1.5 Gbps (SStatus 113) ata1: dev 0 ATA-6, max UDMA/133, 312581808 sectors: LBA48 ata1: qc timeout (cmd 0xef) ata1: failed to set xfermode, disabled ata1: dev 0 configured for UDMA/100 scsi0 : sata_sil ... repeats for ata[234] and then fails to find the root device ... With 2.6.14: ata1: dev 0 cfg 49:2f00 82:346b 83:7d01 84:4003 85:3469 86:3c01 87:4003 88:207f ata1: dev 0 ATA, max UDMA/133, 312581808 sectors: lba48 ata1: dev 0 configured for UDMA/100 scsi0 : sata_sil ... ata[234] output, boots just fine ... Any ideas? Clem - : send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html