best file system to house a debian mirror?

[Simon Blake <simon@citylink.co.nz>]

Hi all

I'm currently replacing the servers that run ftp.nz.d.o, and wondered if 
there were any recommendations on which file system would be best to 
house debian/ubuntu mirrors running rsync/http/ftp at decent loads?  
Currently we use reiserfs on LVM on etch, the new servers are running 
lenny with LVM over 12 sata disk software RAID 6, and I'm thinking about 
moving to XFS.

I suspect there isn't a one-answer-fits-all, but any opinions would be 
interesting.

Cheers
Simon