Hi, I'm puzzled by an ASUS P5GC-MX/1333 with a WD320AAJS disk. My 5.2 DVD refused to see the hard disk. As the CD happened to have a bad MD5 sum, I assumed this was due to a bad burnt image.
Backed off to 5.1. Installation of 5.1 to /dev/sda went OK, then I upgraded by yum to 5.2. But, at the next boot, the new kernel can't see the disk. Only when BIOS IDE Setup is "compatible" I can boot the new kernel. However, the disk shows up as /dev/hdc and performance is noticeably slow. If I choose any other mode, nash complains that any LVM groups can't be found and panics away.
I/O in general is terrible. Copying a CDROM to a file with dd renders the machine nearly unusable.
The kernel provided in 5.1 can work in the BIOS IDE Setup "enhanced/SATA" and performance is really good. Hdparm when under the current kernel says 3.51 MB/s buffered speed, whereas for the older kernel it claims some 111+ MB/s.
I have updated the BIOS ROM to no avail. What am I missing? Is there anything I can do except keep trying kernel updates?
TIA