Besides the SPR for 6.5.2 fault recovery, what is the “superblock” and how does it relate to names.nsf (on the server)?
If I had a problem with my superblock would I know it? 
Thank you!
Subject: Superblock
I’m extrapolating from my linux knowledge, because we don’t use AIX.
The Superblock has nothing to do with domino, it is a unix filesystem item.
The superblock contains infos about the used filesystem, where the directory starts etc.
Filesystems like ext2 (under Linux) are storing secondary superblocks on the partition, so with some check tools, they can repair the primary superblock from the copies. I think AIX should support something like that.
You should recognize problems with your superblock, if you get problems access your filesystems.
Andreas Hoster