Thanks to those that replied. The problem now appears to be solved. One
system was connected slightly differently onto the ATM backbone. At one site
the 100Mb link connected to a switch which connected via a 622Mb link to the
ATM. At the other site it went through two switches, all via 100Mb links.
This system was moved such that one of the routers was removed and the link
to the ATM became a 155Mb link. Restesting showed that FTP performance is
now comparable both ways.
Regards,
Dave Campbell.
-----Original Message-----
From: dave.campbell_at_vf.vodafone.co.uk
[mailto:dave.campbell_at_vf.vodafone.co.uk]
Sent: 03 August 1999 09:42
To: tru64-unix-managers_at_ornl.gov
Subject: file transfer performance on DE500s
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 Wed Aug 04 1999 - 14:31:43 NZST