At 08:36 PM +0100 07/14/2005, Simon Royal wrote:
I have a question regarding the 10/100/1000 Ethernet on a G4 1.25GHz 1GB and a
10/100/1000 Ethernet on a G5 dual 2Ghz 1.5GB.
We currently backup our Ethernet Disk using a Lacie d2 AIT2 Firewire
drive on the G4. It is only backing up at 6GB an hour. After
extensive testing and
troubleshooting worked out that the read speed of the Ethernet disk on the G4
(and every other Mac beit 10/100 or 10/100/1000) was very slow, but
on the G5 it was fast.
Retrospect (is slow) issues aside... Verify that the NICs on the
other Macs are connecting at the same speed, and that your switch can
handle the total throughput. Also verify that you're timing only one
read pass, not a read-write-verifyread.
Can anyone shed any light onto it. The G4 is running Panther 10.3.9
and the G5 is running Tiger 10.4.2, but if this was an OS problem
then wouldnt the write speed also be slow.
Fully buffered read vs blocked write. *shrug*
Could be that Tiger is using jumbo packets if you're running the NIC
at 1 Gbps? (guessing)
Might be interesting to do some timings by just copying gigantic
files from one drive to the other. Eliminate Retrospect from the
equation.
- Dan.
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