Rajko M. wrote:
On Sunday 06 May 2007 17:51, Donn Washburn wrote:
Rajko M. wrote:
On Sunday 06 May 2007 13:15, Donn Washburn wrote:
Has anyone noticed this problem? It maybe a problem with hdparm dealing
with the sda drive and not hda
Can you give output of hdparm that is making trouble to you.
The transfer rate of 66 interface is lower than the 66 MB/s.
How much lower depends on many factors.
Just trying to change the to 32 (1) bit from the default 16 (0)
# hdparm -c1 /dev/sda
/dev/sda:
setting 32-bit IO_support flag to 1
HDIO_SET_32BIT failed: Invalid argument
IO_support = 0 (default 16-bit)
#
It seems to be a "sda" related issue and not hdparm.
It happens on three different machine running 10.3Alpha2
Any more questions let me know
I did also upgrade hdparm in a effort to see if it was hdparm or the sda
issue
I guess that you found Sid's mail. The sdparm is not applicable.
You said that they are IDE drives on older 500 MHz system, so hdparm should be
right application. I'm not familiar with hdparm internals so I ran test on my
older computer with 10.3 alpha 1 and it shows the same error, although I used
symlink hda that points to sda ie. solving naming:
hdparm -c1 /dev/hda
That might be because the device ID major is changed from 3 to 8. Which
probably confuses hdparm. The
hdparm -i /dev/hda
claims that parameter is not applicable for the device. The same works fine in
10.2.
The speed test
hdparm -t /dev/hda
shows speed of 55 MB/s for ATA 100 drive, which seems to be right. For details
on transfer rates
http://www.realworldtech.com/page.cfm?ArticleID=RWT011701000000
The difference between 16 and 32 transfer is non existent on older machine,
both show 55 MB/s. The reason is probably oldfashioned parallel cable that
has 16 lines for data transfer and using 32 bit brings no improvement, except
on very old systems where CPU load is 1/2 if it can send 32 bits to
controller at once.
I did mention this to Donn in a private email, then we got into the
subject of the difference between cables.
OFF TOPIC:- One thing I read said, in order to minimise crosstalk, that
all 80 wires are connected at the blue end, but 40 connect to the grey
connector, the other 40 go to the black connector. However, trying to
verify it using a DVM, I got shorts registered on the same pins on both
the grey and the black connectors. One suggestion from Donn is that
they use 40 pins and 40 earths commoned up at the blue (motherboard)
end. This seems likely as shorts on a number of pins can be measured on
the connectors, though I haven't done enough to verify how they are
distributed. Then there is the connundrum as to how the whole thing
looks electrically when connected to devices and a motherboard.
Regards
Sid.
--
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks
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