cancel
Showing results for 
Search instead for 
Did you mean: 

FTP speed on blade servers

James George_1
Trusted Contributor

FTP speed on blade servers

Hi

Iam new in Linux.

This is my problem. We have 9 servers in a blade enclosure , all running Linux , Redhat.
The ftp is very slow between two of these servers. We have 2 subnets invloved here. One of of the servers is on 10.17.3.X and all the other servers on 10.17.13.X . FTP ( 4 GB file) between servers on the same subnet is done in 2 minutes. But from servers on one subnet to the other subnet server, it takes hours !! . WE have involved HP and our n/w team and everything is ok on the n/w side / router / switch side. The Speed setting is also (correct 1GB FULL DUPLEX ) and we don't find any problem.

Now we are doubting the OS side ...Can some one help ?

Rgds/ James
forum is for techies .....heaven is for those who are born again !!
14 REPLIES
Rob Leadbeater
Honored Contributor

Re: FTP speed on blade servers

Hi James,

I doubt that this is an OS thing. Sounds more like something in the network to me...

How are the two subnets linked together ?

Cheers,

Rob

P.S. You might want to let people know exactly which version of RedHat you're running just in case...
Ivan Ferreira
Honored Contributor

Re: FTP speed on blade servers

>>> WE have involved HP and our n/w team and everything is ok on the n/w side / router / switch side.

How did you determine this?

Can you post the output of netstat -ni of both servers?

Have you tried a packet trace/dump, for example, with tcpdump?
Por que hacerlo dificil si es posible hacerlo facil? - Why do it the hard way, when you can do it the easy way?
James George_1
Trusted Contributor

Re: FTP speed on blade servers



Here is the version details .

2.6.9-42.0.8.ELsmp #1 SMP Tue Jan 23 12:49:51 EST 2007 x86_64 x86_64 x86_64 GNU/Linux

We even did an ftp from outside the blade to the blade server and it went very well. Looks like it got something to do with the switch inside the Blade Enclosure. But , none of us are good in Linux / blade which is a new arrival in our environment.

Rgds/ JAmes
forum is for techies .....heaven is for those who are born again !!
James George_1
Trusted Contributor

Re: FTP speed on blade servers

Yes, we did the ( HP) tcpdump . We tried ftp between different servers in and out of the different subnets . The problem is only on this specific server, rest all the servers are transfering data very fast.

rgds/ James
forum is for techies .....heaven is for those who are born again !!
James George_1
Trusted Contributor

Re: FTP speed on blade servers

Hi Ivan

here is the netstat -in outputs

mixdb01p:/root>netstat -in
Kernel Interface table
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
eth0 1500 0 2743481325 0 0 0 4544026452 0 0 0 BMRU
lo 16436 0 61277474 0 0 0 61277474 0 0 0 LRU





mixdb02d:/root>netstat -in
Kernel Interface table
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
eth2 1500 0 376081554 0 0 0 785191661 0 0 0 BMRU
lo 16436 0 20926155 0 0 0 20926155 0 0 0 LRU


James
forum is for techies .....heaven is for those who are born again !!
Stuart Browne
Honored Contributor

Re: FTP speed on blade servers

How big is the subnet mask on each end?

You say you're using different networks, so unless they've got a very large subnet mask, the FTP has to be going through a router somewhere, which means it's probably leaving the blade enclosure and coming back in.
One long-haired git at your service...
James George_1
Trusted Contributor

Re: FTP speed on blade servers

The subnet mask are 255.255.255.192 and 255.255.255.128.

You are right, there is cisco 3020 switch , part of the blade .

Rgds/ James
forum is for techies .....heaven is for those who are born again !!
Stuart Browne
Honored Contributor

Re: FTP speed on blade servers

That's a Layer 2 switch, not a router, so it's leaving the 3020, hitting something outside the enclosure, then coming back in.

Well, that's what I feel from what I've read.
One long-haired git at your service...
Stuart Browne
Honored Contributor

Re: FTP speed on blade servers

Forgot to add, 'traceroute' is your friend.
One long-haired git at your service...
James George_1
Trusted Contributor

Re: FTP speed on blade servers

traceroute shows 1 hop and its fine.

rgds/ James
forum is for techies .....heaven is for those who are born again !!
Stuart Browne
Honored Contributor

Re: FTP speed on blade servers

Then there's still some information missing, given they are both on different subnets, and both subnet masks are fairly tight.

Show routing tables on both.

Also show iptbales rules on both (both -t filter and -t nat).
One long-haired git at your service...
Rob Leadbeater
Honored Contributor

Re: FTP speed on blade servers

Another thing to consider is that blades tend to have a number of NICs...

Please post the output of

# ifconfig -a
and
# netstat -rn

from a server on each subnet. As others have said, this would appear to be a routing issue.

You've said that Linux is new to you, so it would be useful to see actual output of commands, rather than you just saying the output is "fine".

Cheers,

Rob
Matti_Kurkela
Honored Contributor

Re: FTP speed on blade servers

With blade servers (at least the new c-series), the speed/duplex state you're seeing with the OS tools (ethtool and the like) will refer to the blade rack's internal wiring only. The internal wiring is forced to 1GB Full Duplex at the hardware level, so it would be surprising if this is incorrect.

To know the speed/duplex settings of the physical outgoing interfaces, you must examine the settings of the enclosure's integrated switch module. If using a pass-through module instead of the integrated switch, the external switch *must* be 1GB Full Duplex capable: the pass-through module is 1GB Full Duplex *only*.

MK
MK
Steven E. Protter
Exalted Contributor

Re: FTP speed on blade servers

Shalom,

If it were all systems on the blade, I'd suspect you outstripped the blades network capacity with demand.

I would suspect in this instance that its a network switch port issue, perhaps duplex is set manually and it should not be.

SEP
Steven E Protter
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com