hm, i am not sure what you mean exactly, but i can give you any informations `bout limits for filesystems on solaris 2.6:
logical blocksize ufs: 8192 kb
physical blocksize : 512 bytes
fragment size: 1kb
minimum free space: 10%
rotational delay (gap): depends on the disktype
optimization type: time or space
number of bytes per inode: 2048 (2kb)
ufs filesystems supports blocking sizes of 4096 or 8192 (4 or 8 kb). 8 kb is the recommended blocksize. you can change the fragmentsize to 1,2,4, or 8kb.
since this version of solaris u can mount files bigger than 2 GB (large file systems) with the option -largefiles.
i hope this is partly what you want
cheers, alex...