I never really pay block size much attention but obviously there can be benefits to choosing something other than the default. I am looking for a good "best practices" paper on choosing block size. Also, when used on top of LVM is it's performance payoffs or importance negated in any way? TIA
Larger block sizes reduce fragmentation, at the cost of some wasted space at the end of the block. Having said that, give the size of most hard drives these days, unless you are storing something like a mail or news spool you should use
4096 as it matches the page size (in memory) with the block size on disk.
If you are storing a mail spool, then you should look at using something like XFS which is more efficient at storing large numbers of small files.