I am literally dumbfounded by this. Server was working fine to all of a sudden one day, everything on the Xserve decided to run ridiculously slow and crash at times. I am running slow leopard 10.6.5 and basically any task will run slow, from exploring through finder to launching and configuring server admin.
However as soon as you disconnect the server from the network, things will speed up to normal.
I confirmed it wasn't the network interfaces (eth0 eth1) both having manual IPs however tried picking one up off DHCP, still no better. Disabled the running services (AFP, MYSQL, NETBOOT, NFS, SMB, Server Updates, WEB) DNS server is on a WIndows platform which seems to be running fine. I've cloned the OS and ran it off a ext HDD and had the same issue, I've upgraded RAM to 10GB still no change.
Open Directory is running on this system however all macbooks authenticate through AD.
System log hasn't really helped, I tried to do an update however it keeps "halting".
Haven't tried a repair install just worried about the outcome, the server is mainly used for Web hosting, file sharing and managing macbooks.
Not sure where else to go would appreciate any help, and also I am a rookie so please go easy 0:-)