IOWAIT Problem with 4 connected servers

Hi

I have a DELL server with 4 Sata disks with a Raid 5 which I use as a backup server. 4 Serves are mounting this backup server and use the cpbackup to write the daily backup to the backupserver. It's mounted with NFS. Mounting everyhting works fine, but when the backup starts, the server IOWAIT value is going up to 100 and the server is getting very very slow.

I'm using the newest firmware on the server and the controller, and the newest Kernel for Centos 3.3.

Is this normal, that the server performance is going down so much? The cpbackup will never finish like this...

In the raid controller configuration I saw the following:

Read Cache Enabled

Write Cache Disabled (If I'm rembmer right, I got a warning message, when I want to turn this on)

Thanks
Michael

 

 

 

 

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