Slow disk writes

Fr0dders · 17 Feb 2008 at 20:56

while attempting to copy files on my Vista SP1 (RTM) system, im getting about 25MB/s write speed to a 74gb raptor

benchmarks seem to incidate i should be getting about 70 MB/s

and this is from gigabit network to disk as well as disk to disk. Any ideas where im going wrong ?

rpstewart · 17 Feb 2008 at 22:19

Those are the sort of speeds you'll get from a gigabit LAN. If the disk to disk copy is from the same disk then again the speed is about right.

To get a true idea of the write speed you'll need to either use something like the pro version of HDTach (which needs a blank drive) or another disk, preferably a RAID0 array which will read significantly faster than the target disk to ensure that the target drive is the bottleneck.

Fr0dders · 17 Feb 2008 at 22:46

im not that bothered if thats about right

id never actually bothered looking at numbers before i tryed SP1, but couldnt remember how bad it was before. I'm doing a fresh install at some point, so will make a point of taking down the before as well as the after speeds

decto · 17 Feb 2008 at 23:40

You might want to look at teracopy, it's a free utility that takes over windows drag and drop copies.

From my main PC to the server also running XP I used to get ~15-20MB/sec. With teracopy I now get 40MB/sec.

Main PC
3.2Ghz Core2, 3GB XP 32bit etc

Server
AMD 3600X2 1GB XP etc

Switch
Gigabite GS608 + GS605 ( only use two switches as I have a single cat6 cable between two clusters)

Also playing with freenas... hoping for better results now I've got around XP dropping the lan after 10GB or so.

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