Drop cell disks before converting to 1/8th rack

Hi ! , Today i like to share my experience about an issue i faced during the deployment of Exadata Eight Rack.  I faced following issue while executing Exadata deployment step 2 (Executing Update Nodes for Eighth Rack). We faced the issue because storage cells were shipped with default cell disk groups and they need to be dropped before we can continue deploying Exadata Eight Rack.

Issue : 

[root@node1linux-x64]# ./install.sh -cf Intellitrans-ex.xml -s 2
Initializing
Executing Update Nodes for Eighth Rack
Error: Storage cell [cellnode1, cellnode2, cellnode3] contains cell disks. Cannot setup 1/8th rack. Drop cell disks before converting to 1/8th rack rack.
Collecting diagnostics...
Errors occurred. Send /u01/onecommand/linux-x64/WorkDir/Diag-180626_150747.zip to Oracle to receive assistance.

ERROR:
Error running oracle.onecommand.deploy.operatingSystem.ResourceControl method setupResourceControl
Error: Errors occured...
Errors occured, exiting...

Reason : Cell disk already exist , you can validate by login into all storage nodes. 

[root@cellnoe1~]# cellcli
CellCLI: Release 18.1.4.0.0 - Production on Tue Jun 26 16:13:33 EDT 2018

Copyright (c) 2007, 2016, Oracle and/or its affiliates. All rights reserved.

CellCLI> list celldisk
FD_00_ru02 normal
FD_01_ru02 normal
FD_02_ru02 normal
FD_03_ru02 normal

Solution : drop celldisk all force;

[root@cellnode1 ~]# cellcli
CellCLI: Release 18.1.4.0.0 - Production on Tue Jun 26 16:18:11 EDT 2018

Copyright (c) 2007, 2016, Oracle and/or its affiliates. All rights reserved.

CellCLI> list celldisk
FD_00_ru02 normal
FD_01_ru02 normal
FD_02_ru02 normal
FD_03_ru02 normal

CellCLI> drop celldisk all force;

CellDisk FD_00_ru02 successfully dropped
CellDisk FD_01_ru02 successfully dropped
CellDisk FD_02_ru02 successfully dropped
CellDisk FD_03_ru02 successfully dropped

CellCLI> list celldisk