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On Exadata, you cannot simply resize the diskgroup, because it contains many different disks. Each of your DATA and RECO diskgroups contain 36 different disks (12 from each storage server). You'll need to resize the griddisks at the storage server level rather than at the ASM level. I highly recommend reading MOS note #1245494.1 a few times before going through the process.
My idea was:
step 1> resize from ASM by ALTER DISKGROUP RECO RESIZE ALL SIZE xxG REBALANCE POWER 11;
step 2> resize GRIDDISKs of RECO* on each cell for each griddisk by CellCLI> ALTER GRIDDISK griddisk_name size=xxG;
step 3> check griddisk detail for RECO
step 4> check size of a DATA griddisk
step 5> check free space on CELLDISKs
step 6> resize GRIDDISKs of DATA* on each cell for each griddisk by CellCLI> ALTER GRIDDISK griddisk_name size=new_sizeG;
step 7> resize from ASM by ALTER DISKGROUP DATA RESIZE ALL REBALANCE POWER 11;
step 8> check status of all asmdisks using "v$asm_disk"
step 9> check DB alert logs
step 10> check cell alert history on each cell
Now, I'm reading your suggested note #1245494, thanks very much