Resizing a volume didn't work

Hi,

I was trying to resize a volume

# df -h /ab/dir1
Filesystem            Size  Used Avail Use% Mounted on
/dev/vx/dsk/Ab_DG/work
                       38G   16G   22G  41% /ab/dir1

vxassist maxgrow showed the following

# vxassist -g Ab_DG maxgrow work
Volume work can be extended by 19900416 to: 99592192 (48629Mb)

I used the command

#vxassist -g Ab_DG growto work 99592192

It returned no errors but when I checked the size again it has not changed.

# df -h /ab/dir1
Filesystem            Size  Used Avail Use% Mounted on
/dev/vx/dsk/Ab_DG/work
                       38G   16G   22G  41% /ab/dir1

When I tried to extend again

# vxassist -g Ab_DG maxgrow work
VxVM vxassist ERROR V-5-1-15319 Volume work cannot be extend within the given constraints: Not enough HDD devices that meet specification.

This means I have no free space. I am wondering where did the free space go if it did not add up to the volume. I restarted vxconfigd -k but that did not help. Can some one please explain and propose a solution