shrink a file system

I need shrink a file system with 320G to 269 G. When I run vxresize I get
the message:

/etc/vx/bin/vxresize -g EMC1 N_Plex_EMC -106954752

vxvm:vxresize: ERROR: Cannot determine file system current size for volume
N_Plex_EMC

I can not undestand this. see the out of df -k:

/dev/vx/dsk/EMC1/N_Plex_EMC 335544320 232626632 102917688 70%
/nplex_emc

and the volume manager show me the right size.

Why doesn't VxVM get the VxFS size ? Anybody can help me?

thanks in advance,

Cleyton Ferreira
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