On 05/06/2010 02:18 PM, Ian FREISLICH wrote:
joe wrote:
I have 3 boxes, each with two nics. One nic for the private network and
one for the public network.
The private network is all on the same vlan. All 6 nics are on the same
switch. All connections are 1000tx Full Duplex.
I will call the servers Box A, Box B, and Box C.
When i FTP data between Box A& B i get abou 25MB/sec.
When i FTP data from Box C to Box A or B, i get about 20MB/sec.
When i FTP data from Box A to C i get 10MB/sec
When i FTP data from Box B to C i get 200KB/sec...
Can anyone suggest why i might only be getting 200KB when transfering
data from Box B to C but not when transferring data from Box A to C?
Is the hardware exactly the same on all 3 hosts? From your enumeration
it looks like there's something special about box C.
How busy are the disks? One of the problems with FTP, at least the
last time I tried to use it for benchmarking was that it used tiny,
tiny transfers to and from disk. Strangely scp did better even
with the crypto overhead. Have you tried using netperf to test the
network performance?
Have you checked your cables? I've seen all sorts of wierd problems
caused by cables. netstat -ni should give an idea of transmission
problems. If the switch is a managed switch, you can also check
its interface counters.
Ian
--
Ian Freislich
Hi Ian,
Thanks for the help!
The servers are mostly different. Server A & B run on consumer grade
motherboards/ram/nics. They both have a 12 disk raid 5 setup. Server C
is a dual quad core xeon processor supermicro server. It's Disk setup is
raid5 using the intel raid matrix. The switch is managed but i dont have
the login information for it (been years since i've had to log in ;().
The switch is a netgear gigabit switch. I've had the cables replaced as
well as trying two different ports on the switch, and ended up with the
same results. I've included the netstat -ni results below. While we
might be at a disadvantage until i get access to the managed switch, is
there anything else we might be able to try , to resolve the problem?
Joe
Name Mtu Network Address Ipkts Ierrs Idrop
Opkts Oerrs Coll
igb0 1500 <Link#1> 00:30:48:9f:11:04 8617 0 0
6108 0 0
igb0 1500 216.105.91.14 216.105.91.145 7066 - -
6082 - -
igb1 1500 <Link#2> 00:30:48:9f:11:05 3126 0 0
680 0 0
ipfw0 65536 <Link#3> 0 0 0
0 0 0
lo0 16384 <Link#4> 0 0 0
0 0 0
lo0 16384 fe80:4::1/64 fe80:4::1 0 - -
0 - -
lo0 16384 ::1/128 ::1 0 - -
0 - -
lo0 16384 127.0.0.0/8 127.0.0.1 0 - -
0 - -
pflog 33152 <Link#5> 0 0 0
0 0 0
vlan1 1500 <Link#6> 00:30:48:9f:11:05 1374 0 0
680 0 11
vlan1 1500 192.168.1.0/2 192.168.1.2 796 - -
677 - -
vlan1 1500 192.168.1.210 192.168.1.210 2 - -
0 - -
vlan1 1500 192.168.1.211 192.168.1.211 0 - -
0 - -
vlan1 1500 192.168.1.212 192.168.1.212 0 - -
0 - -
vlan1 1500 192.168.1.213 192.168.1.213 0 - -
0 - -
vlan1 1500 192.168.1.214 192.168.1.214 0 - -
0 - -
vlan1 1500 192.168.1.215 192.168.1.215 0 - -
0 - -
vlan1 1500 192.168.1.216 192.168.1.216 0 - -
0 - -
vlan1 1500 192.168.1.217 192.168.1.217 0 - -
0 - -
vlan1 1500 192.168.1.218 192.168.1.218 0 - -
0 - -
vlan1 1500 192.168.1.219 192.168.1.219 0 - -
0 - -
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