I'm in the process of doing some testing on a GS140 with DU4.0E BL1, and I'm
getting some odd behaviour when using ftp to transfer test files between two
members of a cluster. The network setup is using 100BaseT, full duplex on
both the GS140s and the switch ports. This has been checked to ensure all
the settings are correct (I've been assured by the our networks group that
the settings are correct!). When I ftp out of one member into the other I
get roughly half the performance of that when I ftp in. The cluster members
are in the same subnet but are separated by several switches an ATM backbone
and approx. 2-3km.
I've changed network cards and gone through all the settings/checks I know
and everything looks fine to me. I've repeated the ftp tests to other
systems in different subnets and the trend continues. The other cluster
member appears to give comparable results either way. The slower member of
the two does have a slightly more diverse route onto the ATM backbone than
its other member, but as ftp connections go in at twice the rate as they
come out, it shows that the connection can run at the faster speed.
On the one hand it suggests some difference with one of the systems - but I
can't find one - on the other it might suggest some network differences
outside the box. Can anyone give me some suggestions on what to double
check, what probing questions I should ask our network guys. Also if anyone
knows of a useful article in the archives, please forward me the link - I've
tried searching, but come up with little so far!
TIA,
Dave Campbell
(dave.campbell_at_vf.vodafone.co.uk)
Received on Tue Aug 03 1999 - 08:45:57 NZST