While looking for the documentation for MT-DAAPD, which I just installed on my Linux server for iTunes sharing, I discovered that it can also be installed on a LinkStation from this LinkStation Wiki and I also discovered that alternate firmware is available for the Linkstation.
I didn’t install MT-DAAPD on my LinkStation, but I did install the OpenLink firmware, which among other things adds telnet & ssh access and allows additional software to be installed. With the new software I added SMART disk monitoring and an NFS server.
The NFS server works beautifully and is a big improvement over SMB & AFP.