Write blocks are cached in memory until Data ONTAP writes the blocks to disk. After write blocks are written to disk, you can have write blocks that Data ONTAP considers to be random moved from memory to the WAFL extended cache to improve read cache rates for certain workloads.
Workloads that read data blocks soon after Data ONTAP writes random blocks to disk might benefit from enabling the caching of blocks from random write workloads.
This command is available through the nodeshell. You access the nodeshell by using the system node run command. For more information, see the man page.