# fsck /dev/stgA
The current volume is: /dev/stgA
Primary superblock is valid.
J2_LOGREDO:log redo processing for /dev/stgA
Primary superblock is valid.
Invalid data detected in aggregate inode 2.
Invalid data detected in aggregate inode 2.
fsck: 0507-278 Cannot continue.
File system is dirty.

You can check the primary and secondary superblocks on your volume with the following commands.

# lquerypv -h /dev/stgA 8000 100 # try primary superblock
# lquerypv -h /dev/stgA F000 100 # try secondary superblock

On my system the output looks like this.

0000F000 4A324653 00000001 00000000 46A0EDB0 |J2FS........F...|
0000F010 00000000 00000000 00000000 00007374 |..............st|
0000F020 67410000 00000000 00000000 00000000 |gA..............|
0000F030 00000000 00000000 00000000 F3FE1668 |...............h|
0000F040 00001000 0000000C 00000200 00000009 |................|
0000F050 00000003 00400000 00000100 00000002 |.....@..........|
0000F060 00000400 0000000B 00000400 0000F450 |...............P|
0000F070 00000000 00000000 00000000 00000000 |................|
0000F080 8000002E 00000002 00000000 00000000 |................|
0000F090 003D3300 1E7FC2CD 00000219 00000032 |.=3............2|
0000F0A0 00000002 00000000 00000000 00000000 |................|
0000F0B0 003D3300 1E7FC2CD 00000000 00000000 |.=3.............|
0000F0C0 00000000 00000000 00000000 00000000 |................|
0000F0D0 00000000 00000000 00000000 00000000 |................|
0000F0E0 00000000 00000000 00000000 00000000 |................|
0000F0F0 00000000 00000000 00000000 00000000 |................|