How do you pick the best block size?

[kly]

Hi,

We have always accepted the defaults for our servers but I'd like to try customizing settings for better space and performance. Does anyone have a good formula or can point me to some good documentation on picking the best block size? We're going to have a new hard drive with a smaller number of bigger files.

I understand about picking a good inode density based on how many files we'll store. I also see that they recommend a frag size of 1/8 the blocksize. I know they recommend larger blocks, but I'm just confused about how do you know the best size to pick? What is the maximum blocksize UFS2 supports?

Thanks!