Device(s) not found

we have AIX server connected to DMX-3. I tried to use powermt config but no result. I can see disks from lsdev -Cc disk

root@lexus1:/usr/lpp/EMC/Symmetrix/bin>./inq.aix64_51
Inquiry utility, Version V7.3-771 (Rev 0.0) (SIL Version V6.3.0.0 (Edit Level 771)
Copyright (C) by EMC Corporation, all rights reserved.
For help type inq -h.

........

-----------------------------------------------------------------------
DEVICE :VEND :PROD :REV :SER NUM :CAP(kb)
-----------------------------------------------------------------------
/dev/rhdisk0 :IBM H0:ST3146855LC :C808 :0006CC8E : 143374000
/dev/rhdisk1 :IBM H0:ST3146855LC :C808 :0006CEA0 : 143374000
/dev/rhdisk2 :EMC :SYMMETRIX :5772 :7800022250 : 92160
/dev/rhdisk3 :EMC :SYMMETRIX :5772 :78002cd250 : 106064640
/dev/rhdisk4 :EMC :SYMMETRIX :5772 :78002d0250 : 106064640
/dev/rhdisk5 :EMC :SYMMETRIX :5772 :78002d3250 : 106064640
/dev/rhdisk6 :EMC :SYMMETRIX :5772 :78002d6250 : 106064640
/dev/rhdisk7 :EMC :SYMMETRIX :5772 :78002d9250 : 106064640
root@lexus1:/usr/lpp/EMC/Symmetrix/bin>cd /
root@lexus1:/>powermt display dev=all
Device(s) not found.

your help please?