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 - -Received on Thu May 06 2010 - 19:14:25 UTC
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