Why is uploading to Win2k3 server much slower than downloading

[outonalimb]

Does anyone know why copying to (uploading) to a Windows 2003 Server is much slower than copying from (downloading)?

For example, I have a 100MB file which when copied TO the server takes around 45 seconds. If I copy the same file from the server (download) it takes around 10 seconds.

The server is on the same 100Mb LAN segment as my laptop.

Can anyone enlighten me on this?

Thanks,

 

[xmsre]

I'd highly suspect it's a storage issue. How are the disks configured? RAID 5?

 

[LawnBoy]

I suspect your laptop is not as effient at serving files as your server is.


"We must fall back upon the old axiom that when all other contingencies fail, whatever remains, however improbable, must be the truth." - Sherlock Holmes

 

[LawnBoy]

err, make that "efficient" ...


"We must fall back upon the old axiom that when all other contingencies fail, whatever remains, however improbable, must be the truth." - Sherlock Holmes

 

[xmsre]

Could be a single ATA drive on on a laptop is certainly slower than SATA or SCSI on the server.

Could also be the RAID configuration on the file server. RAID 5 writes 4 times slower than it reads. This is a function of the RAID 5 write penalty. In the post, I see about a 4X difference between the time to write and time to read.

In any event, I highly doubt it's a network issue; it's far more likely a storage bottleneck.

 

[theravager]

Possible the server has a bad performing antivirus, macafee would be a prime example.

Writes generally use a lot more resources on a disk subsystem.

Weird things like this are also common if network speed/duplex isnt set correctly. Use a util like iperf to check throughput in both direction.