This is alive and well in 2.6.13 (final) on ia64. Excerpts from dmesg when booting: Fusion MPT base driver 3.03.02 Copyright (c) 1999-2005 LSI Logic Corporation Fusion MPT SPI Host driver 3.03.02 GSI 28 (level, low) -> CPU 1 (0xc218) vector 49 ACPI: PCI Interrupt 0000:06:02.0[A] -> GSI 28 (level, low) -> IRQ 49 mptbase: Initiating ioc0 bringup ioc0: 53C1030: Capabilities={Initiator} scsi0 : ioc0: LSI53C1030, FwRev=01030a00h, Ports=1, MaxQ=255, IRQ=49 Vendor: QUANTUM Model: ATLAS IV 9 SCA Rev: 0B0B Type: Direct-Access ANSI SCSI revision: 03 SCSI device sda: 17942584 512-byte hdwr sectors (9187 MB) SCSI device sda: drive cache: write back SCSI device sda: 17942584 512-byte hdwr sectors (9187 MB) SCSI device sda: drive cache: write back sda: sda1 sda2 sda3 Attached scsi disk sda at scsi0, channel 0, id 0, lun 0 Vendor: MAXTOR Model: ATLAS10K4_73SCA Rev: DFV0 Type: Direct-Access ANSI SCSI revision: 03 SCSI device sdb: 143666192 512-byte hdwr sectors (73557 MB) SCSI device sdb: drive cache: write back SCSI device sdb: 143666192 512-byte hdwr sectors (73557 MB) SCSI device sdb: drive cache: write back sdb: sdb1 Attached scsi disk sdb at scsi0, channel 0, id 1, lun 0 Vendor: ESG-SHV Model: SCA HSBP M17 Rev: 1.0D Type: Processor ANSI SCSI revision: 02 GSI 29 (level, low) -> CPU 2 (0xc418) vector 50 ACPI: PCI Interrupt 0000:06:02.1[B] -> GSI 29 (level, low) -> IRQ 50 mptbase: Initiating ioc1 bringup ioc1: 53C1030: Capabilities={Initiator} scsi1 : ioc1: LSI53C1030, FwRev=01030a00h, Ports=1, MaxQ=255, IRQ=50 Fusion MPT FC Host driver 3.03.02 Fusion MPT misc device (ioctl) driver 3.03.02 mptctl: Registered with Fusion MPT base driver mptctl: /dev/mptctl @ (major,minor=10,220) When I'm up and running, measure the speed of sda and sdb: # hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 62 MB in 3.02 seconds = 20.56 MB/sec [This is VERY consistent from run to run, 20.56 MB/s every time]. # hdparm -t /dev/sdb /dev/sdb: Timing buffered disk reads: 2 MB in 4.04 seconds = 53.79 kB/sec [Speed on sdb is very erratic ... 53.79 KB/s is the worst I saw in half a dozen tests ... but first try after boot was 47.14 MB/s, and I see intermediate rates all over the map: 545.42 KB/s, 5.13 MB/s, 32.61 MB/s] dmesg shows some messages like this: mptscsih: ioc0: >> Attempting task abort! (sc=e0000001fceb4c80) mptbase: ioc0: IOCStatus(0x0048): SCSI Task Terminated mptscsih: ioc0: >> Attempting task abort! (sc=e0000001fceb5080) mptbase: ioc0: IOCStatus(0x0048): SCSI Task Terminated mptscsih: ioc0: >> Attempting task abort! (sc=e0000001fceb6e80) mptbase: ioc0: IOCStatus(0x0048): SCSI Task Terminated mptscsih: ioc0: >> Attempting task abort! (sc=e0000001fceb7a80) mptbase: ioc0: IOCStatus(0x0048): SCSI Task Terminated Sometimes there are floods of these, other times just a few ... e.g. I saw just those 8 lines after ten iterations of "hdparm -t /dev/hdb". -Tony - : 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