Hi folks,
I have an HP Proliant 140DL G2 server with what appears to be an IDE drive in non-DMA mode. Performance on the server is extremely bad when large amounts of disk activity is taking place.
I think the problem is that my drive is not in DMA mode:
# hdparm /dev/hda
/dev/hda: multcount = 16 (on) IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 0 (off) keepsettings = 0 (off) readonly = 0 (off) readahead = 256 (on) geometry = 16383/255/63, sectors = 80026361856, start = 0
...but I can't set it on:
# hdparm -d1 /dev/hda
/dev/hda: setting using_dma to 1 (on) HDIO_SET_DMA failed: Operation not permitted using_dma = 0 (off)
...which I think is because the IDE controller isn't really recognized, or is pretending to be a SATA controller:
# lspci -v | less 00:1f.2 IDE interface: Intel Corporation 82801EB (ICH5) SATA Controller (rev 02) (prog-if 8a [Master SecP PriP]) Subsystem: Hewlett-Packard Company: Unknown device 3208 Flags: bus master, 66Mhz, medium devsel, latency 0, IRQ 193 I/O ports at <unassigned> I/O ports at <unassigned> I/O ports at <unassigned> I/O ports at <unassigned> I/O ports at 1470 [size=16]
All the google hits I've seen so far imply I have to build a kernel module but I'd rather not get into the business of rolling my own kernel if I don't have to.
I spun through the HP support page for this box/OS combo, and I don't see any SATA/IDE/ATA drivers, only SCSI/SAS drivers.
So before I continue on, can I get a sanity check here -- am I barking up the right tree?