Problem to enlarge soft partition in Sun Cluster 3.1u4

Hi all,
scenario :

I have a Sun Cluster 3.1u4

scconf -p
.......................
Cluster name:                                     

Quorum device name:                                d4
  Quorum device votes:                             1
  Quorum device enabled:                           yes
  Quorum device name:                              /dev/did/rdsk/d4s2
  Quorum device hosts (enabled):                   pegasomxp1 pegasomxp2
  Quorum device hosts (disabled):                  
  Quorum device access mode:                       scsi3

Device group name:                                 orapegDR
  Device group type:                               SVM
  Device group failback enabled:                   no
  Device group node list:                          pegasomxp2, pegasomxp1
  Device group ordered node list:                  yes
  Device group desired number of secondaries:      1
  Device group diskset name:                       orapegDR

Device group name:                                 pegappDR
  Device group type:                               SVM
  Device group failback enabled:                   no
  Device group node list:                          pegasomxp1, pegasomxp2