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AIX available memory reports half. How do I allocate more resources to root?

I have an AIX server that runs WebSphere under root.  We are trying to give WebSphere 2GB of the 6GB installed on this server, however we seem to only have half the RAM we assumed.  Perhaps RAM is reserved for fail-over?  We can't tell.

Here's what we know:
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eggm4n

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bash-3.00# ulimit -a
core file size        (blocks, -c) 1048575
data seg size         (kbytes, -d) unlimited
file size             (blocks, -f) unlimited
max memory size       (kbytes, -m) unlimited
open files                    (-n) unlimited
pipe size          (512 bytes, -p) 64
stack size            (kbytes, -s) 32768
cpu time             (seconds, -t) unlimited
max user processes            (-u) 262144
virtual memory        (kbytes, -v) unlimited

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bash-3.00# svmon -G
               size      inuse       free        pin    virtual
memory      1511424     975166     536258     139553     892495
pg space     786432       2232
 
               work       pers       clnt
pin          139553          0          0
in use       892495          0      82671
 
PageSize   PoolSize      inuse       pgsp        pin    virtual
s   4 KB          -     937630       2232     118033     854959
m  64 KB          -       2346          0       1345       2346

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Topas is an excellent resource.  Thanks for the pointers.  The attached is the current state, and I can plainly see that I have 6GB available.  It's also showing the server at low utilization after an application hang.  This will really help us diagnose what's wrong.

Knowing that svmon reports on 4k pages is something we'll never forget again.
Topas Monitor for host:    leasrv014            EVENTS/QUEUES    FILE/TTY
Mon Mar  2 10:33:05 2009   Interval:  2         Cswitch     465  Readch        0
                                                Syscall     259  Writech     119
Kernel    0.5   |#                           |  Reads         0  Rawin         0
User      0.1   |#                           |  Writes        0  Ttyout      119
Wait      0.0   |                            |  Forks         0  Igets         0
Idle     99.4   |############################|  Execs         0  Namei       146
                                                Runqueue    0.0  Dirblk        0
Network  KBPS   I-Pack  O-Pack   KB-In  KB-Out  Waitqueue   0.0
en0       0.2      1.0     0.5     0.0     0.1
lo0       0.0      0.0     0.0     0.0     0.0  PAGING           MEMORY
                                                Faults        0  Real,MB    5904
Disk    Busy%     KBPS     TPS KB-Read KB-Writ  Steals        0  % Comp     59.7
hdisk0    1.4      9.9     2.5     0.0     9.9  PgspIn        0  % Noncomp   5.8
hdisk1    1.4      9.9     2.5     0.0     9.9  PgspOut       0  % Client    5.8
cd0       0.0      0.0     0.0     0.0     0.0  PageIn        0
                                                PageOut       0  PAGING SPACE
Name            PID  CPU%  PgSp Owner           Sios          0  Size,MB    3072
java         327726   0.2 511.9 root                             % Used      0.7
topas        335948   0.0   1.1 root            NFS (calls/sec)  % Free     99.2
getty        299180   0.0   0.4 root            ServerV2       0
gil           69666   0.0   0.9 root            ClientV2       0   Press:
rpc.lock     229504   0.0   1.2 root            ServerV3       0   "h" for help
qdaemon      286894   0.0   0.2 root            ClientV3       0   "q" to quit

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Thx again.  Folks like you are why I maintain a membership to EE.
I'm very glad I could help you.
Thanks for the points, you are always welcome!
Cheers
wmp