Connect to CLUSTER SVC:

IBM_2145:xxxx:admin>SVCCONFIG BACKUP
…………..
CMMVC6155I SVCCONFIG processing completed successfully
IBM_2145:xxxx:admin>SVC_SNAP DUMP
Collection system information..
Dumping error log…
Waiting for file copying to complete…
Waiting for file copying to complete…
Creating snap package…
Snap data collected in /dumps/snap.152035...tgz
IBM_2145:xxxx:admin>

Connect to SVC GUI, go to troubleshooting menu, select support, click show full log listing and select with DX mouse the dump snap.152035...tgz and select download.