MySQLDump slow when target is a windows share

[Nickolai Nielsen]

Hi

I have a very strage issue.

i have an client/server application thats uses MySql, this app has over 100 installations.

One one site i expirience a very slow performance when dumping data from mysql back to the a server share.

The setup is a central server with file share and a MySQL database.
the app runs on the client, and the client run mysqldump for backup, and this dump uses the result switch with the target being a share on the server.
Normally this setup runs very smooth.
Database dump size is 1,2gb and around 100 tables with a few of them taking 90%

1. When dumping from server via client to server share: 300 kb/s
2. When dumping on server to server disk: 30 mb/s
3. When dumping from server to client disk: 30 mb/s

option 2 and 3 is not usable in normal day to day operation.

a normal filecopy of a 1,2gb file runs at 40-50 mb/s
a filecopy both ways at the same times runs at 20 mb/s per file.

network switch and network card in the server have been changed, 2 different clients have been testet.

any good ideas on where to go from here?

btw server runs windows 2008, client 1 windows 7, client 2 windows xp.