Which three steps should you perform before executing the following command which will set the cell flash
cache mode to write back?
# cellcli –e alter cell flashcachemode=writeback
A.
Inactivate all physical disks on the cell.
B.
Shutdown the cellsrv services on the cell.
C.
Disable the storage indexes on the cell.
D.
Inactivate the grid disks on the cell.
E.
Create a new flash cache on the cell.
F.
Drop the existing flash cache on the cell.
B,D,F
Step 1. Drop the flash cache on that cell
#cellcli –e drop flashcache
Step 2. Check the status of ASM if the grid disks go OFFLINE. The following command should return ‘Yes’ for the grid disks being listed:
# cellcli -e list griddisk attributes name,asmmodestatus,asmdeactivationoutcome
Step 3. Inactivate the griddisk on the cell
# cellcli –e alter griddisk all inactive
Step 4. Shut down cellsrv service
# cellcli -e alter cell shutdown services cellsrv
Step 5. Set the cell flashcache mode to writeback
# cellcli -e “alter cell flashCacheMode=writeback”
Step 6. Restart the cellsrv service
# cellcli -e alter cell startup services cellsrv
Step 7. Reactivate the griddisks on the cell
# cellcli –e alter griddisk all active
Step 8. Verify all grid disks have been successfully put online using the following command:
# cellcli -e list griddisk attributes name, asmmodestatus
Step 9. Recreate the flash cache
# cellcli -e create flashcache all
Step 10. Check the status of the cell to confirm that it’s now in WriteBack mode:
# cellcli -e list cell detail | grep flashCacheMode
Step 11. Repeat these same steps again on the next cell to the FINAL cell. However, before taking another storage server offline, execute the following making sure ‘asmdeactivationoutcome’ displays YES:
# cellcli -e list griddisk attributes name,asmmodestatus,asmdeactivationoutcome
http://www.oracle.com/technetwork/articles/database/exadata-write-back-flash-2179184.html