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Off Topics > IT Help Needed

nojohnny101
Elite Veteran
Location: 10 miles north of Cincy, OHIO

hey
quick question for you tech savy know hows...

how fast should a direct ethernet connection be between two computers....

both computers have gigabit ethernet cards, and the cable is a CAT 5

reason i ask is because a file transfer is taking longer than expected:
446 GB is projected to take about 32 hours

*some additional info:
- i'm copying a large folder 446 GB from one computer to the other
- the file is currently on a external hard drive that is hooked to computer 1 by firewire 800, and is being transferred directly from the external hard drive to an internal hard drive of the other computer
- the hard drive of computer 2 is internal and is currently setup in RAID 1 configuration, could this be slowing it down?

appreciate the help....i'm searched on google with mixed answers, but it seems true gigabit speed can't be achieved

Thanks
~Will-i-am~

05-10-2008 05:33 AM

HOMEPAGE

Mark C
Key Veteran
Location: Houston, TX - USA

Nothing off the top of my head right now except you may have one of the cards set up for half duplex.

05-10-2008 05:47 AM

InvertedDude
Heliman
Location: USA

nojohnny101

Windows Vista has a bug that delays or take longer to transfer files than XP.

05-10-2008 06:15 AM

helo_chris
Veteran
Location: goodlettsville, tn

Is your cable cat5e or just cat5? cat5 isnt rated for gigabit it has to be cat5e. Transferring from an external drive across a network connection could slow it down a little. And yes copying to a Raid 1 config will slow it down somewhat because it has to write the data twice. That is the downside to Raid 1, good for redundancy and you get faster reads but slower writes. It actually sounds like a combination of factors. Also I would check and set both NICs to 1G half duplex. Otherwise you may get a lot of collisions that will slow you down also.

"There is a fine line between cutting edge and bleeding edge.."

05-10-2008 06:45 AM

HOMEPAGE

skyking1
Heliman
Location: Zanesville, Ohio

Full-duplex

You want both gig nics manually set to 1 gig/full duplex. Half duplex causes collisions..............

Are the nic drivers current? Cat 5 or Cat 5E cabling? Cat6 is approved for gig bandwidth. I assume when you say direct connected - you're not going through a small router or switch. If you are most are not rated for 1 gig speeds, most are only 100mb. Some of the very new high-end wired/wireless routers have 1gig switches in them.

05-10-2008 12:18 PM

HOMEPAGE

rcsoar4fun
Veteran
Location: Corpus Christi, TX

The limit on transfer is almost certainly a system issue, not network issue. If you are concerned about the switch just get a crossover cable and connect the PCs directly. Cat5 will actually allow gige speeds just fine, but can take errors, normally on long cable runs.

Windows, all versions, have a limitation on how fast they will transfer a file. Vista tends to be worse. Are you using a shared folder to transfer or some program? You will probably see much better speed using FTP from one PC to the other than using the Winders share.

Lastly you could try bumping up the MTU size. Normally windows defaults to 1500, over a direct Gige connection it should be much higher. You might not be able to adjust this on your switch or even PC, depends on the driver. It would be under the advanced tab of the network card config.

Vote smart, vote RP!

05-10-2008 04:41 PM

HOMEPAGE

rcadd1ct
Elite Veteran
Location: Richardson, Texas

Turn off your anti-virus for the copy.

-RCA .......... Making Cuisinarts Fly!!!!!!!

05-10-2008 04:44 PM

deafheliflyer
Veteran
Location: Arizona

rcsoarforfun

Good point..

Coming from someone who is a "network administrator" for a living.. That makes sense.. I know Vista is worse and slower for transfer but, this doesnt sound like a "window Vista issue per se"

Hope this is resolved

Crash-Prone and overcoming it!!!

05-10-2008 05:16 PM

nojohnny101
Elite Veteran
Location: 10 miles north of Cincy, OHIO

hey
thanks guys for the responses...

well i tried going into the advanced properties of the network card and went to the duplex speed and these were the options (Windows XP Pro OS)

"10 Mbps Full Duplex"
"10 Mbps Half Duplex"
"100 Mbps Full Duplex"
"100 Mbps Half Duplex"

this leads me to believe that it doesn't support gigabit transfers? But when i go to the "status" of the LAN connection, it says "Speed: 1.0 Gbps"

more details:
i am not going through a router, i am doing a direct connection

i have MTU size on computer 1 set to: "9000" and computer 2 set to: "1500"

here are the two ethernet cards i am using:
computer 1: 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector)
computer 2: SiS191 Ethernet Controller

Thanks
~Will-i-am~

05-10-2008 06:16 PM

HOMEPAGE

rcsoar4fun
Veteran
Location: Corpus Christi, TX

MTU needs to match on both sides, otherwise TCP takes over and sets it to the lowest in the connection.
You updated the card drivers?

Vote smart, vote RP!

05-10-2008 06:21 PM

HOMEPAGE

HotsHabit
Senior Heliman
Location: Idaho

Your waiting on the hard drive to write the data, not the transfer through the network. 446 gig is going to take a while to write.

05-10-2008 09:04 PM

rcadd1ct
Elite Veteran
Location: Richardson, Texas

Might have been faster to move the external drive to the new system.

-RCA .......... Making Cuisinarts Fly!!!!!!!

05-10-2008 09:09 PM

helibandit
Senior Heliman
Location: Jacksonville, North Carolina - United States

might have something to do with the speed at wich your external drive transfers also.. they are usualy slow..

The only time you can have too much fuel is when your on fire

05-10-2008 09:21 PM

nojohnny101
Elite Veteran
Location: 10 miles north of Cincy, OHIO

hey
some updates....

over the past couple of days with using this setup....i have noticed this:

- transfer speeds from the drivers of computer #2 (the ones that are setup in RAID 1) are very acceptable, and are fast
- transferring the same files though from computer #1 to computer #2 slows it down....way down (see quoted speed above)

it is again fast though and fine when i am reading data from the drives of computer #2....just seems to be write speeds that are suffering

i have a utility on computer #1 that monitors the amount of data that comes in/out of the ethernet cable, here the numbers i regularly see:

* writing data from computer #1 to computer #2 is typically 6 mb/s
* reading data from computer #2 to computer #1 is typically 25mb/s or greater
* writing data from computer #2 to computer #1 is typically 25 mb/s or greater

does this narrow down the problem any?

these numbers has to mean something....i just don't know what

Thanks
~Will-i-am~

05-15-2008 10:32 PM

HOMEPAGE

HotsHabit
Senior Heliman
Location: Idaho

Once again, the bottleneck is on the write speeds of the particular hard drive as well as the size of the cache of the drive. This isn't a networking problem.

05-15-2008 10:40 PM

nojohnny101
Elite Veteran
Location: 10 miles north of Cincy, OHIO

hey

Quote
Once again, the bottleneck is on the write speeds of the particular hard drive as well as the size of the cache of the drive. This isn't a networking problem.

i don't quite understand this

the internal drives that i am writing information to (computer #2) are these:
Hitachi Desktar 500g 7200RPM

7200RPM....doesn't that determine write speed? How come then that computer #2 can write to computer #1 fast than computer #1 can write to computer #2....the harddrive in computer #1 is also a 7200RPM 750gig?

not trying to be diffcult, just trying to understand

...and if i'm lucky....maybe a solution or fix

i appreciate your time and expertise!

Thanks
~Will-i-am~

05-16-2008 02:21 AM

HOMEPAGE

rcsoar4fun
Veteran
Location: Corpus Christi, TX

7200 is just how fast it spins. In theory yes, it reads faster, but there are lots of other things. Its like putting the JR 8717's on a Kyosho Concept, still not a 3d machine.

Vote smart, vote RP!

05-16-2008 02:25 AM

HOMEPAGE

spog
Senior Heliman
Location: Ontario, Canada

With older 7200 rpm drives, with older crappy onboard gigabit nic's, running through a dlink wired gigabit router, I can transfer about 1 GB/min.

05-16-2008 03:18 AM

Splix
Senior Heliman
Location: Lafayette, IN

Your straight bottle neck is your external drive. It doesnt matter how fast the connection between the PC and drive is, it will always be horribly slow transferring from an ex. drive on one pc to another pc. Just take that external, crack it open, and mount the drive internally. That will solve your issues.
Trust me, I've done it/dealt with it a million times.
The external drive on fw800, so now instead of 1gbps, your already limited to 800megs, and whatever is going from the external drive, the 'puter has to cache that onto its own internal drive to get it ready for the transfer (another lag down). So once it finally gets the data to the NIC, its already slowed way the hell down.
1. Either mount the external on the 'puter your trying to push the data to
2. Mount the drive internally
3. Wait for the long @$$ transfer

Those are your options

Wheels are for wienies!

05-16-2008 01:48 PM

HOMEPAGE

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