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Assume that the RDBMS and ASM instances are up and you are enabling write-back flash cache in one cell server at a time. Which step(s) should you perform before executing the following command you your Exadata X9M-8 Database Machine, which will set the cell flash cache mode to write-back? #cellcli -e alter cell flashCacheMode=WriteBack
Correct Answer: C,F
To enable the write-back flash cache on an Exadata X9M-8 storage cell, the existing flash cache must be removed before transitioning to a new mode. This is because the flash cache configuration-whether set to write-through or write-back-requires a re-initialization of the flash storage to apply the new caching behavior. The steps are as follows: Drop the Existing Flash Cache: Before altering the cache mode, any existing flash cache on the cell must be dropped. This clears the existing configuration and allows the system to reallocate flash resources under the new mode. The command for this is: # cellcli -e "drop flashcache" Create a New Flash Cache in Write-Back Mode: After dropping the existing flash cache, you can create a new flash cache with write-back mode enabled. This step ensures that the flash cache is configured correctly to handle write operations before they reach disk, thus accelerating write-heavy workloads. The relevant command to set write-back mode is: # cellcli -e "create flashcache all" This process will reset the flash cache with the write-back mode enabled, thereby caching both read and write operations effectively.
