How to expannd Aggr0 in Netapp 7 mode Data Ontap 8.2

These steps also applicable for any aggregate expansion in system.

1. To be on safer side back up all the /etc files to a different location. If any production volume hosted then    those also needs to be backed up.

2. To verify that appropriate spare disks are present to the system.
  Execute below commands
   netapp7mode1>aggr status -s
 Verify that enough number of spares Disk of same type, size, speed are there as of aggr0.

3.Execute below command to see just the result with option -n this command will not be executed rather
  it will display the disks that Data ONTAP would automatically select. Based on that you can decide
  whether to use suggested one or not.

  netapp7mode1> aggr add aggr0 -n -g rg0 2
        aggr add aggr0 -g rg0 -d v5.21 v5.20

  ----> where 2 is the number disk that you want to add.
4. If you decide to use the Data Ontap suggestion then just copy the output of above command and paste
it
    netapp7mode1> aggr add aggr0 -n -g rg0 2
        aggr add aggr0 -g rg0 -d v5.21 v5.20
    netapp7mode1> aggr add aggr0 -g rg0 -d v5.21 v5.20
            Fri Sep 19 16:28:05 GMT [netapp7mode1:raid.vol.disk.add.done:notice]: Addition of Disk /aggr0/plex0/rg0/v5.20 Shelf ? Bay ? [NETAPP   VD-1000MB-FZ-520 0042] S/N [08375604] to aggregate aggr0 has completed successfully
            Fri Sep 19 16:28:05 GMT [netapp7mode1:raid.vol.disk.add.done:notice]: Addition of Disk /aggr0/plex0/rg0/v5.21 Shelf ? Bay ? [NETAPP   VD-1000MB-FZ-520 0042] S/N [08375705] to aggregate aggr0 has completed successfully
            Addition of 2 disks to the aggregate has completed.