dhdurgee@xxxxxxxxxxx wrote:
I have recently purchased an Areca ARC-5020 external eSATA II RAID to connect to my system. This unit supports ICH NCQ and multi-port for multiple volumes. I have connected it to my Intel DG41TY mainboard, which has the Intel 82801GB I/O Controller Hub (ICH7), but I find I am only seeing the first volume and the unit shows NCQ is inactive. Looking at udev for the SATA-II port I see the following: KERNEL[1247932822.419400] add /devices/pci0000:00/0000:00:1f.2 (pci) UDEV_LOG=3 ACTION=add DEVPATH=/devices/pci0000:00/0000:00:1f.2 SUBSYSTEM=pci DRIVER=ata_piix PCI_CLASS=1018F PCI_ID=8086:27C0 PCI_SUBSYS_ID=8086:D612 PCI_SLOT_NAME=0000:00:1f.2 MODALIAS=pci:v00008086d000027C0sv00008086sd0000D612bc01sc01i8f SEQNUM=1221 syslog shows the following: ata_piix 0000:00:1f.2: PCI INT B -> GSI 19 (level, low) -> IRQ 19 ata_piix 0000:00:1f.2: MAP [ P0 P2 P1 P3 ] ata_piix 0000:00:1f.2: setting latency timer to 64 scsi2 : ata_piix scsi3 : ata_piix ata3: SATA max UDMA/133 cmd 0xf0e0 ctl 0xf0d0 bmdma 0xf0a0 irq 19 ata4: SATA max UDMA/133 cmd 0xf0c0 ctl 0xf0b0 bmdma 0xf0a8 irq 19 ata3.00: ATA-6: Areca ARC-5020-VOL#00, 0100 AX, max UDMA/133 ata3.00: 1052732928 sectors, multi 16: LBA48 NCQ (depth 0/32) ata3.00: configured for UDMA/133 scsi 2:0:0:0: Direct-Access ATA Areca ARC-5020 0100 PQ: 0 ANSI: 5 sd 2:0:0:0: [sda] 1052732928 512-byte hardware sectors: (538 GB/501 GiB) sd 2:0:0:0: [sda] Write Protect is off sd 2:0:0:0: [sda] Mode Sense: 00 3a 00 00 sd 2:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA So NCQ is detected on the RAID unit but is not enabled and only one of the two volumes is being seen. Am I missing something that needs to be enabled for the driver to support the advanced features? Is my configuration loading the proper driver? If not, how can I load it?
ata_piix is loaded for legacy IDE emulation, and is limited by IDE interface in number of supported ports. NCQ is not supported by this interface.
ahci driver supports "native mode", with full NCQ and all ports. ICH7 chip usually supports both legacy IDE and native AHCI modes. Jeff -- To unsubscribe from this list: 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
