As with anything, it depends on what files.
Some are better at large files, others at small, its really mostly preference tho. Ext2 should be fine, i dont think there are any popular file systems that accel at read only, so pick whatever you like best, ext2 is a good choice as it should be widely supported, so if your already using it, you might as well continue using it unless you have a good reason for using another file system (which depends on workload, and what type of files youll be dealing with).
|