Hi,
When doing a dmesg command, I've noticed the following entries:
hda: Maxtor 6Y060L0, ATA DISK drive
hda: DMA disabled
blk: queue c03cb420, I/O limit 4095Mb (mask 0xffffffff)
hdc: FX4821T, ATAPI CD/DVD-ROM drive
hdd: Seagate STT20000A, ATAPI TAPE drive
hdc: DMA disabled
hdd: DMA disabled
hde: WDC AC310200R, ATA DISK drive
hdf: QUANTUM FIREBALL ST6.4A, ATA DISK drive
blk: queue c03cbcb8, I/O limit 4095Mb (mask 0xffffffff)
blk: queue c03cbdf4, I/O limit 4095Mb (mask 0xffffffff)
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
ide2 at 0xbc00-0xbc07,0xb802 on irq 10
hda: host protected area => 1
hda: 120103200 sectors (61493 MB) w/2048KiB Cache, CHS=7476/255/63, UDMA(100)
hde: task_no_data_intr: status=0x51 { DriveReady SeekComplete Error }
hde: task_no_data_intr: error=0x04 { DriveStatusError }
hde: host protected area => 1
hde: 20044080 sectors (10263 MB) w/512KiB Cache, CHS=19885/16/63, UDMA(33)
hdf: task_no_data_intr: status=0x51 { DriveReady SeekComplete Error }
hdf: task_no_data_intr: error=0x04 { DriveStatusError }
hdf: 12594960 sectors (6449 MB) w/81KiB Cache, CHS=13328/15/63, UDMA(33)
The question is, why would DMA on the hard drives be (apparantly) turned
off? I'm pretty sure that the drives in question support DMA (which would
speed up access, right?).
(On a side note, I'm pretty sure it's making a mistake WRT hde - that drive
is UDMA 66, and upon boot, when the IDE controller (PCI board) that hde and
hdf are connected to comes up, it says ATA/66 for the first drive (hde).
Unless the kernel just goes with the slowest drive in the chain and assumes
that speed for both drives...?)
I seem to remember that there's a command you can stick in your rc.local to
turn drive DMA on. Can anyone let me know what it is? And, of course, if
there are any pitfalls I should be aware of regarding using it with any of
the above three drives? Thanks for any info.
--Dave
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