nick, the server is not the point (if windows then 2003 standard would be just fine) - the storage would be more important. this could be a software raid of sATA-disks up to external fibre-devices ... if it's some kind of hardware-raid make sure it supports grab-through (does not cache the whole file from which only a few bytes are requested ) and NCQ (re-ordering of block-requests) ... to select components and configure this is a job for experts who are then also responsible for the performance and goes far beyond the scope of this forum.
christian
christian
and remember: only a CRAY can run an endless loop in just three seconds.