On Sunday 30 November 2003 07:29 pm, Edward Dekkers wrote:
> Pete Nesbitt wrote:
> > On November 28, 2003 04:07 pm, Reuben D. Budiardja wrote:
> >>Hi all,
> >>Is it true that secondary IDE is slower than Primary? I have a brand new
> >>Western Digital 120 GB 7200 RPM HD, and because I don't have a place on
> >> the primary IDE, I unplug the (unused) CD-ROM and use the secondary IDE
> >> as the harddrive connection.
> >>I checked with "hdparm -tT" and the Timing buffered disk reads is
> >> horrible: about 25 MB/sec. This is of course in linux single mode.
> >>On my other machine, the same WD HD (80 GB) on primary IDE gives me
> >> almost twice the troughput. I checked all options that can be enabled in
> >> hdparm to be enabled (multcount, dma, 32-bit I/O) , so I ended up have
> >> all the same options enabled for those 2 system, but the one with the HD
> >> in secondary IDE has considerably slower I/O.
> >>
> >>Anything that I might overlook? Any info is greatly appreciated.
> >>
> >>RDB
> >
> > Hi Reuben,
> > There is no reason the secondary controller would be any slower, if they
> > are both the same. I have seen board where the primary controller
> > supported EIDE or ATA but the secondary only supported regular IDE. You
> > could see if the cable is a 40 or 80 wire (I think all the ata66 and
> > higher use the 80 wire cables). Is it the master or single drive on the
> > chain?
> >
> > Presuming it is not using a regular older IDE cable like the one the CD
> > would have been using, you should take the new drive, and mount it in
> > place of where your 80 GB is on the other machine. It may be a cabling
> > issue or a bad controller. The best way to test hardware, except power
> > supplies, is to put the suspect part into a known good environment. that
> > should give you some definitive information. If the drive is good, try
> > swapping the cables onto the good machine.
>
> And a side note to that - make sure the big difference you're seeing is
> not because the 80Gb is a JB model and the 120 a BB model.
Uhhm..would you care to elaborate what JB / BB means?
Thanks.
RDB
--
Reuben D. Budiardja
Department of Physics and Astronomy
The University of Tennessee, Knoxville, TN
---------------------------------------------------------
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