Setting 32bit IO on SATA drives

[J.A. Magallon]

Hi all...

I have a bunch of SATA drives on a RAID-5 setup.
I was investigating the usual things on ide disks to optimize performance,
with hdparm.

The defalt settings, as they boot:

sata_promise version 1.00
ACPI: PCI interrupt 0000:00:07.0[A] -> GSI 17 (level, low) -> IRQ 177
ata1: SATA max UDMA/133 cmd 0xF0802200 ctl 0xF0802238 bmdma 0x0 irq 177
...
ata1: dev 0 cfg 49:2f00 82:7c6b 83:7f09 84:4003 85:7c69 86:3e01 87:4003 88:407f
ata1: dev 0 ATA, max UDMA/133, 490234752 sectors: lba48
ata1: dev 0 configured for UDMA/133

nada:~# lsscsi -l
[0:0:0:0]    disk    ATA      Maxtor 7Y250M0   YAR5  /dev/sda
  state=running queue_depth=1 scsi_level=6 type=0 device_blocked=0 timeout=30

nada:~# hdparm /dev/sda

/dev/sda:
 HDIO_GET_MULTCOUNT failed: Operation not supported
 IO_support   =  0 (default 16-bit)
 readonly     =  0 (off)
 readahead    = 256 (on)
 geometry     = 30515/255/63, sectors = 251000193024, start = 0

nada:~# hdparm -c /dev/sda

/dev/sda:
 IO_support   =  0 (default 16-bit)

nada:~# hdparm -c1 /dev/sda

/dev/sda:
 setting 32-bit IO_support flag to 1
 HDIO_SET_32BIT failed: Invalid argument
 IO_support   =  0 (default 16-bit)

How can I make 32bit IO active ?

TIA

--
J.A. Magallon <jamagallon()able!es>     \               Software is like sex:
werewolf!able!es                         \         It's better when it's free
Mandrakelinux release 10.1 (Community) for i586
Linux 2.6.9-jam1 (gcc 3.4.1 (Mandrakelinux 10.1 3.4.1-4mdk)) #4


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