DMA RAID query
wieseltux23 at gmail.com
Wed Mar 8 21:49:10 UTC 2006
On Wed, 08 Mar 2006 15:49:29 -0500
Phillip Susi <psusi at cfl.rr.com> wrote:
> It isn't that simply having the drives there slow things down, it is
> using them. IDE can only talk to one of the two drives at a time, so if
> you are reading data from the cdrom, or burning a disc in the writer,
> then the hard drive throughput will drop like a rock.
> dave s wrote:
> > Hi all,
> > I have a working RAID 1 setup
> > hda HDD 180GB RAID
> > hdb DVD burner/reader
> > hdc HDD 180GB RAID
> > hdd DVD reader
> > hdparm -tT /dev/hda and hdc gives ...
> > 1278MB/sec cashed reads
> > 62MB/sec bufferd disk reads
> > Which seems respectable for new 7200 Hitachi drives. (I did not setup DMA, my
> > BIOS did it for me) I was warned never to mix a HDD & a CD/DVD burner as it
> > degrades the HDD speed.
> > I removed hdb and hdd, rebooted and did another hdparm -tT and got the same
> > results.
> > I was going to install a PCI ATA controller for the two DVD drives but am
> > unsure now if it is worth it, can anyone comment (1st time RAID user :)
> > Dave
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