Windows 7 slow copy speed

[Victorwol]

Hi! I have several computers connected to a file server using direct 4Gbit fibre (facilis 24tb Terrablock - 24 1TB drives in raid 5) connections, and using testing tools to test speed of the mounted volumes I get about 400 MB/sec, and using the utility to copy files given by Facilis, I can copy files from and to the served at about 400 MB/s, but when I use windows expoler, speed goes down to only 25MB/s and I'm observing this behavior in all the computers where Windows 7 is installed, one old computer running windows XP does not have the problem, MACs with OSX does not have the problem either.

Any clues why this can be?

 

[pparks1]

I'm curious what type of speeds that you are seeing with Windows XP and OS X? I don't see any possible way that you can be nearing speeds of 400MB/s...as these source machines wouldn't normally have hard drives capable of reading anywhere near that fast to supply the data to your SAN device.

 

[Victorwol]

The device I'm reading from have 24 Drives in RAID as I explained on my first post (facilis 24tb Terrablock - 24 1TB drives in raid 5) so I'm actually have a lot more than 400MB/sec speed on the source drive, it just the bottleneck of the 4Gb fibre card what is limiting me to read 400 MB/s. And I'm getting that speed too on Windows 7, but with some proprietary tools and specific applications, but as soon as I try to move files or copy files with Windows explorer, I never get more than 25 MB/sec, from the same drive. If I use a 3rd party tool to copy files, all goes at maximum speed.

 

[pparks1]

Ok, I didn't realize that you were reading from the SAN device. So, if you are reading data from the network at that speed on your Windows or Mac's..are you writing that data to your local hard drives on the physical machines themselves? If so, you would obviously be limited by the write speed on the hard drive.

I would suspect some sort of a duplex issue...however that would not explain how 3rd party apps are doing it correctly...since they would be using the same network stack, etc.

 

[Victorwol]

My local drives can handle well over 500 MB/s, they are SDDs in RAID 0, I'm about to install a fibre card on an old XP machine and see if I have the same problem. Want to discard that it is a problem of the server.