I presume you're talking about the Microservers? The one housing my audio library is running Server 10.10 32 bit and my setup is pretty much the same as your guide except I'm running dynamic IP and haven't used RAID.
/dev/sda1 /diskpool/d1 ext4 user,noatime,noexec,nodev 0 0
/dev/sdb1 /diskpool/d2 ext4 user,noatime,noexec,nodev 0 0
/dev/sdc1 /diskpool/d3 ext4 user,noatime,noexec,nodev 0 0
/dev/sdd1 /diskpool/d4 ext4 user,noatime,noexec,nodev 0 0
/dev/sde1 /diskpool/d5 ext4 user,noatime,noexec,nodev 0 0
my etc/sources.list entry for Squeezeboxserver is:
deb http://debian-origin.slimdevices.com unstable main
Version: 7.6.2 - r33212 @ Fri Aug 26 04:17:47 PDT 2011
Server IP Address: 192.168.168.201
Server HTTP Port Number: 9000
Operating system: Debian - EN - utf8
Platform Architecture: i686-linux
Perl Version: 5.10.1 - i686-linux-gnu-thread-multi
Database Version: DBD::SQLite 1.34_01 (sqlite 22.214.171.124)
Not having any issues scanning etc - SBS priority is set to normal, Scanner priority set to -20 and Database Memory Config to high.
I'll check the 11.04 installation tonight - if I recall correctly it's a 64 bit install, dynamic IP, no RAID and using the same SBS repository, albeit I've not done a lot with it in terms of using it to serve music - I'll set it to scan my desktop PC's music and report back.