From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Bart Schaefer
On 8/31/07, Alfred von Campe alfred@von-campe.com wrote:
The are all SATA drives (2 HDDs and 2 optical drives). But because there are two controllers, one of the HDDs shows up as /dev/hda and the other as /dev/sda.
If it's showing up as /dev/hda, it's probably being accessed in legacy IDE compatibility mode or some such thing. Check your BIOS.
(With CentOS 3, any time I upgrade the kernel, I have to switch my SATA drives into legacy mode before lilo will write the boot sector properly, and then switch them back again when rebooting.)
Yes, I was going to say this too, make sure the SATA settings in the BIOS are all set to SATA operation and not "legacy", then you should see /dev/sda and /dev/sdb and all DMA, IO size, NCQ and multiple sector settings will be properly negotiated at start-up.
To set these via hdarpm:
hdparm -c 1 /dev/hda (for 32-bit) hdparm -d 1 /dev/hda (for DMA) hdparm -m 16 /dev/hda (multiple sector IO = 16 sectors)
These can be combined to: hdparm -c 1 -d 1 -m 16 /dev/hda
-Ross
______________________________________________________________________ This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy or printout thereof.