A quick note on creating large JFS filesystems on AIX: if the filesystem is 64Gb or might be expanded to over 64Gb any time in the future, make sure the NBPI (Number of Bytes Per Node) is greater or equal to 8192. The default is 4096 and it will prevent you from growing the filesystem to beyond 64Gb in the future. Below is a reference table for FS sizes and corresponding minumum NBPIs.

NBPI        Minimum AG Size        Fragment Size                   Maximum Size (GB)
512            8                                       512, 1024, 2048, 4096     8
1024         8                                       512, 1024, 2048, 4096     16
2048        8                                       512, 1024, 2048, 4096     32
4096        8                                       512, 1024, 2048, 4096     64
8192        8                                       512, 1024, 2048, 4096     128
16384      8                                       512, 1024, 2048, 4096     256
32768     16                                      1024, 2048, 4096              512
65536     32                                      2048, 4096                        1024
131072    64                                      4096                                   1024