AIX Disk I/O Statistics No Data Available

sorry about my poor english
i am evaluating appmanager 10.1 and try to monitor aix disk io but get no data avaliable
i can run iostat-d iostat -x via telnet
below is the result:

# iostat -d

System configuration: lcpu=2 disk=3
                " Disk history since boot not available. "

# iostat -x
Usage: iostat [-a] [-s] [-t] [-T] [-d] [-m] [Drives] [Interval [Count]]
         -a specifies adapter throughput report
         -s specifies system throughput report
         -t specifies tty/cpu report only
         -T specifies time stamp
         -d specifies drive report only
         -m specifies statistics for paths
         -t and -d cannot both be specified

and i try running aix disk io poll command get the result:
# iostat -d;echo '-----DISK_EXTENDED_STATISTICS-----';iostat -d 1 3 > /tmp/amp_iostat.txt;sed 's/% tm_act/%tm_act/g' /tmp/amp_iostat.txt

System configuration: lcpu=2 disk=3
                " Disk history since boot not available. "

-----DISK_EXTENDED_STATISTICS-----

System configuration: lcpu=2 disk=3
                " Disk history since boot not available. "

Disks:        %tm_act     Kbps      tps    Kb_read   Kb_wrtn
hdisk0           0.0       0.0       0.0          0         0
hdisk1           0.0       0.0       0.0          0         0
cd0              0.0       0.0       0.0          0         0
hdisk0           0.0       0.0       0.0          0         0
hdisk1           0.0       0.0       0.0          0         0
cd0              0.0       0.0       0.0          0         0

how can i solve this problem ?