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I need some proffesional help.

post #1 of 14
Thread Starter 
Haha not THAT kind of help .

I am having the following problem. I am currently running a 3D animation studio and have just set up my network.

Only problem is I am not getting the speeds I like. Here is what I have:

Server: Mac Pro 2009, 8 core Xeon, 12GB RAM, 4 Western Digital 2TB disks in RAID 0



Backup Server: Core i7 930 @ 4.0Ghz, 12 GB RAM, 4 Western Digital 2TB disks in RAID 0, mirrors the Mac Pro main server



Render Farm: 6x core i7 930 @ 4.0Ghz, 12 GB RAM, 1TB spinpoint F3 103SJ.



Network switch: NETGEAR ProSafe GS116, has a 32 Gbit backplane, unmanaged, fanless.


Network Cables: CAT 6, 5 Meter

Now here's my problem:

It 'feels' as if the Macpro is not capable of delivering more than half Gigabit speed to the other computers and vica versa. I have read up on some tips in speeding up your network settings, so far I have found that switching from 1500k MTU to 9k MTU makes no difference. The server and renderfarm PC's all have dual gigabit ports. However in Windows 7 I did not manage to get them to work in tandem. I can bridge them but that's about it. The same goes for the Mac Pro. Google is no help here for I keep on stumbling on dumb articles that tell you you need to buy expensive cables to get some data going. Well I did this and in my eyes the hardware is NOT the bottleneck. The switch isn't either I think. I have tried stresstesting it and it is very capable when I copy a lot of files from every computer to another. It never hangs or delays anyhthing.

This is quite a bummer because I bought extra nice expensive stuff to eliminate any data bottlenecks. The RAID 0 is build to deliver ultimate performance and on the Mac itself it works wonderfully. The mirror PC server works flawless too.

However when watching task manager's network bandwidth I am getting only a maximum of 72 MB/sec from the main server to the backup server. It usually stalls around the 50 MB/sec mark. When I open istat on the mac I can see the disks are basically delivering only 14MB/sec per disk a piece when stressed through the network. When I bench the RAID volume they can do almost 80 per disk continuously!

Now I am no expert. I know how basic networking works but that's about it. I believe I have some great hardware installed and I am not willing to buy more $hit to get this to work, it should work with the equipment I bought, no questions asked.

Can anyone help me out on this one? It would mean the world to me if I can reach some serious speeds thanks!

Yours,

Daan
Edited by Shademaster - 3/20/11 at 9:15am
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post #2 of 14
Quote:
When I bench the RAID volume they can do almost 80 continuously!
If the limit of your RAID array is 80MB/s then a max network transfer speed of 72MB/s is honestly pretty good.

The maximum a single 7200rpm hdd can do over the network is usually about 50MB/s. Even with raid 0, I'm guessing your hdds are the bottleneck preventing you from getting any faster than 72MB/s.
post #3 of 14
Thread Starter 
Quote:
Originally Posted by FDS View Post
If the limit of your RAID array is 80MB/s then a max network transfer speed of 72MB/s is honestly pretty good.

The maximum a single 7200rpm hdd can do over the network is usually about 50MB/s. Even with raid 0, I'm guessing your hdds are the bottleneck preventing you from getting any faster than 72MB/s.
I mean 80MB per disk, totalling 320MB/sec.

Sorry.
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post #4 of 14
I'm just making a logical guess here, but your onboard gigabit NICs could also be limiting performance. Often onboard gigabit is not up to par with a dedicated pci-e nic.
post #5 of 14
Full duplex is enabled on both sides? Switch/PC? Why not get a cheap used Cisco 2620 Router? For way more QOS options. Just a suggestion.
post #6 of 14
Thread Starter 
Quote:
Originally Posted by FDS View Post
I'm just making a logical guess here, but your onboard gigabit NICs could also be limiting performance. Often onboard gigabit is not up to par with a dedicated pci-e nic.
I see. Could this also be the case for the MacPro? Is there a way to double the speed of both by somehow teaming them up as 2 dedicated gigabit lines?

I mean, why have 2 if you can use only 1?
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post #7 of 14
Thread Starter 
Quote:
Originally Posted by charlesC8188 View Post
Full duplex is enabled on both sides? Switch/PC? Why not get a cheap used Cisco 2620 Router? For way more QOS options. Just a suggestion.
Yep Full duplex is on on both sides.

The MacPro also functions as internet router for the internal network. One ehternet port i hooked up to 100mbps up/down dedicated network connection. The other ethernet port is doing the internal network.

Is there some setting I am forgetting?

Thanks for the help!
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post #8 of 14
Quote:
Originally Posted by FDS View Post
The maximum a single 7200rpm hdd can do over the network is usually about 50MB/s.
It really just depends more on the read speed of the drive and the type of data you're sending or receiving.

Quote:
Originally Posted by Shademaster View Post
I mean 80MB per disk, totalling 320MB/sec.
What do you get for benching the array as a whole? Even in RAID 0 you aren't going to have a situation where, "Hey, one disk reads at 80 MB/sec, let's just multiply that transfer rate by the number of disks!".

Quote:
Originally Posted by charlesC8188 View Post
Full duplex is enabled on both sides? Switch/PC? Why not get a cheap used Cisco 2620 Router? For way more QOS options. Just a suggestion.
1) His transfers will be within the same subnet (layer 2).
2) There is no half duplex in gigabit.

Quote:
Originally Posted by Shademaster View Post
The MacPro also functions as internet router for the internal network. One ehternet port i hooked up to 100mbps up/down dedicated network connection. The other ethernet port is doing the internal network.

Is there some setting I am forgetting?
Settings on the router side will be irrelevant for devices communicating on the same network/subnet.
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post #9 of 14
Quote:
Originally Posted by beers View Post
2) There is no half duplex in gigabit.
Source?

I know the auto-negotiation speed of gigabit defaults to full, but surely CSMA/CD still operates on all 802.3 interfaces connected to a shared segment.
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post #10 of 14
http://www.cisco.com/en/US/tech/tk38...80094781.shtml

Quote:
Duplex settings—While Cisco devices only support full-duplex, the IEEE 802.3z standard does have support for half-duplex GigabitEthernet. Because of this, duplex is negotiated between GigabitEthernet devices.
If you can name me some devices off hand that readily support half duplex over gigabit I'll give you a gold star.
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