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Slow network transfer

F

fXK

n00b
Joined
Jun 10, 2005
Messages
44
Hey guys not sure what bottle necking my network transfer

When transfering big files it start at 140mb/sec then drop down stable at 80-90mb a sec
I am using netgear 8port gigabit switch <-- maybe use cat6 cable?
Pci gigabit network card <-- maybe this, upgrade to pcie network card?

1sgmc4.jpg

My raid stats seem decent
 
I'm not sure what exactly you expect.

Gigabit network will only get you 100-110MB/sec max.
PCI slot will limit you to 130MB/sec max with no overhead, and there is a lot of overhead, so it will more likely be around 100MB/sec if nothing else that is also on the pci bus is doing anything at all.
 
patrickdk said:
I'm not sure what exactly you expect.

Gigabit network will only get you 100-110MB/sec max.
PCI slot will limit you to 130MB/sec max with no overhead, and there is a lot of overhead, so it will more likely be around 100MB/sec if nothing else that is also on the pci bus is doing anything at all.
Click to expand...

So your saying the network transfer is pretty good already?

How do people get like 100+/200-300MB/Sec? heheh
 
Wouldn't you need 10gbe routers or something? The current throughput situation for "home networks" is absolutely abysmal. But we have endless motherboards sporting PS/2 and 4,000 USB ports.

/end bitter rant
 
Unless you are going with some proprietary multipath type setup bonding (LACP, etc.) is just going to let multiple streams access a server each at full speed - it's still not going to give you one fast stream (which is what most people here want).

If you want faster than 1GbE the best ways are

Direct Attached Storage
1) A SAS/eSata/Thunderbolt/Raid type enclosure - probably the simplest, but storage needs to be attached to one computer (could be shared out from that computer - but only one computer gets > 1 GbE speed).

2) FiberChannel type setup - 4Gb FC cards are relatively cheap on ebay, and Solaris can act as a FC target via COMSTAR. Still limits you to only one computer accessing a set of data directly, but you could in this case have multiple computers connected - each with it's own set of data to access (at full speed).

3) 10GbE nics. You can pick them up for 200ish on ebay. 10GbE switches are still priced pretty highly though, so you end up wanting a port for each computer you want to connect. If it's more than two computers you want to have 10GbE access you can run into practicality issues (at 2 boxes you can put a dual port 10GbE nic in the server, and a single port 10GbE nic in each of the two other boxes you want to connect). Note that other boxes can sitll access the data over 1GbE as well.

With the 10GbE setup you will run into protocol issues though - there's a good bit of tweaking/tuning to do if you want to get much greater than 200-250MB/sec over NFS/SMB (I don't have a 10GbE card to try AFP). NFS does scale a little easier than SMB - and SMB2 should be better, but I haven't tried a SMB2 capable server.
 
Unless you are going with some proprietary multipath type setup bonding (LACP, etc.) is just going to let multiple streams access a server each at full speed - it's still not going to give you one fast stream (which is what most people here want).
Click to expand...

I thought it could/would combine the bandwidth for a single stream however I see what you mean.
 
Only round-robin bonding would do that. And doing round-robin bonding with a switch wouldn't be very good.

The issue is, packets coming in out of order, the machine will then say it's missing a packet, and ask for a retransmit. So normally a single stream is limited to the bandwidth of a single connection.
 
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