I am currently unable to extend a jfs filesystem beyond 32T. As soon as it goes over 32T it corrupts the filesystem and fsck is unable to repair it.
I have experienced this using jfsutils version 1.1.13, 1.1.14, and 1.1.15. I have even downloaded the CVS version on 2011-MAR-28 and it shows the same issue. After the error occurs I can mount the filesystem in read only mode, but am no longer able to use the filesystem in any practical manner. So I have a 200T file server that I can only use in 31T blocks. I was really hoping that version 1.1.15 would finally resolve this issue.
I have attached a file showing the scenario and commands that I ran.