Slow (buffered) disk reads while dma etc is optimized

vert

I got a system in which there are 4 hard drives. All report about the same (slow...) disk reads with hdparm. This averages around 155MB/sec for buffer-cache reads and between 34 and 45 MB/sec for buffered disk reads.
Except hda. This is the root drive and hdparm reports around 14 MB/sec for buffered disk reads. What's up with that? I turned on all optimization with hdparm (see below) and still this slow. What could be the problem. The server is currently running 2.4.19-gentoo-r10.

output hdparm /dev/hda

BradN · Posted: Mon Jun 02, 2003 8:18 pm Post subject:

Are they all the same model hard drive? It's possible the hard drive is just slower... 14MB/s is kinda low, but seems reasonable for older stuff. My 30GB laptop drive only gets 20MB/s.

Beltzak · n00b Joined: 02 Jun 2003 Posts: 10

You should upgrade your kernel to 2.4.20 or use an ac kernel.
My trouble was ALI Chipset bug and hdparm gaves not more than 8Mb on disk read ;( Now that's solve

vert · Posted: Tue Jun 03, 2003 6:56 am Post subject:

Could be indeed the age of the drive. It just seemed so slow...
And I'm planning on updating, but since it's our home server, it is kind of a hassle. I'm actually thinking on upgrading to 2.5 since I'm pretty happy with that on my own system.