Paul Brown wrote:
>
> Mark,
>
> > I have been searching for the hardware compatibility list, but I
> > think that it's not up to date yet. My question is that Does readhat
> > 6.2 support Ultra 3 160M/s scsi card and scsi hard drive? if yes, which
> > brand should I use ? How about Apaptec 19160 or 29260 U3W scsi Card ?
>
> The U2W works because it *is* in the compatibility list. U3W? Unknown.
>
> > Also, I am not able to receive any messages back from all of the redhat
> > list, even my own messages for over one week. I have been tried
> > to subscribe several times, but still doesn't work. Do you know what
> > the problem is.
>
> There are mail routing issues on the net these days. Be patient, the
> mail admin will sort it out.
>
> Paul
>
> ---------------------------------------------------------------------------
> Paul B. Brown [EMAIL PROTECTED]
> President
> Brown Technologies Network, Inc. http://www.btechnet.com/
>
> Systems and Applications Design, Development, Deployment, and Maintenance
> ---------------------------------------------------------------------------
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Paul:
UDMA33 and UDMA66 (as I undertand it) are DMA transfer protocols. A
Hard Drive will we either IDE traditional (pio I thik it is called) DMA
transfer. UDMA (Ultra DMA) 33 is faster, and UDMA66 is even faster
again. For big Hard Drives one needs fast spin rates like 7200 and I
understand that in order to keep that data transfer efficient then
UDMA66 is a good compliment. Apparently, UDMA66 was for some time
associated with SCSI operation but now it appears to be common with IDE
hard drives. I understand that the IDE controller chips are responsible
(at least some part of the traditional CPU board chip set) for
facilitating standard/traditional IDE DMA transfer rates, UDMA33 and
UDMA66 transfer rates.
Apparently, it has nothing to do with Linux and more to do with the
hardware. For example, If I have a UDMA33 Hard drive to install on a
Slackware Linux where the chipset does not support UDMA33, then DMA
operation will automatically revert to the slower standard/traditional
speed. Similarly, if I have a Red Hat 6.2 Linux OS that has a chipset
on the CPU board that only supports UDMA33 then a Hard drive with UDMA66
will revert to UDMA33 operation. Or if that same board did not support
either UDMA66 or UDMA33, DMA operation would revert to the slower
standard/traditional transfer speed.
If you are going to buy a CPU board buy one with UDMA66 chipset support
and buy hard drives that support UDMA66 DMA protocol. The Linux that
you install doesn't care. But it will know about the protocol and will
tell you so in the boot up messages.
I got this information from a guy that occasionally provide my network
with support assistance when I'm over my head in problems.
Bye-thanks_TED
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