I am using a Seagate barracuda 80 GB ATA 100 HDD with Red Hat 7.2
My drive was previously in ATA33 mode and now it is in ATA 100 mode. I'll check about this "blue end" of the cable thing.
Alvin Oga wrote:
On Wed, 11 Feb 2004, Andreas Janssen wrote:
Hello
Darin Strait (<[EMAIL PROTECTED]>) wrote:
I'm troubleshooting something that has been bugging me for a while...
Why does my drive seem to run only in UDMA2 and only do about 19.50 MB/s, according to hdparm? Everyone else always seems to have a faster drive than me, so I'm assuming that I'm misconfiguring something and it's not my hardware.
I have fiddled with idebus=66 in my grub menu.lst, but it has never seemed to have an effect.
Please don't change that parameter if you don't really know what it does. idebus is the speed in Mhz that the IDE bus uses. This has nothing to do with ATA33 or ATA66. The ATA numbers name the theoretical data throughput in MB/s. Unless you use some server mainboard your system very probably only supports a bus speed of 33 MHz.
or risk losing everything on disk... not a biggie ... a good way
to test backups :-)
I have an i810e motherboard and I'm running 2.6.2 (other kernel versions have had similar results). I have a Western Digital WD1200BB drive, the specs are as follows:
[...] - Mode 5 Ultra ATA 100.0 MB/s
that'd tell me that the disk is capable of udma5...
but the mb is NOT recognizing it ... - check your bios ... - check your cables as andreas said - use the 80conductor cable - do NOT use round cables
DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 *udma2
something is seriously broken ... on your system ...
[...] * signifies the current active mode
No. It signifies the mode that is used /if/ DMA is activated. If you switch of DMA it will still tell you *udma2.
and dma is enable so its good ... but the hdparm says it doesnt
support udma3/4/5 ... - either the specs is wrong or the bios is broken
Timing buffer-cache reads: 288 MB in 2.02 seconds = 142.31 MB/sec Timing buffered disk reads: 58 MB in 3.01 seconds = 19.27 MB/sec
My guess: wrong type of cable. Make sure it can do more that udma2.
but for udma2, something is seriously broken on your system ( you're at high risk to have your disk trashed )
http://www.Linux-1U.net/Disks/
udma2 - 13MB/sec ( whacky new xfer vs PIO modes ) udma3 - 16MB/sec umda4 - 33MB/sec udma5 - 66MB/sec udma6 - 100MB/sec udma7 - 133MB/sec
have fun alvin
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