Which statement describes how memory and NVRAM are used by ONTAP during write requests?
A. The write request enters memory and is passed to NVRAM and the partner’s NVRAM, a write acknowledgement is sent to the client, and data is written to disk at the next consistency point.
B. The write request enters NVRAM and is passed to the partner’s NVRAM, data is written to disk, and a write acknowledgement is sent to the client.
C. The write request enters memory and is passed to the partner’s NVRAM, data is written to disk, and a write acknowledgement is sent to the client.
D. The write request enters memory, a write acknowledgement is sent to the client, the request is passed to the partner’s NVRAM, and data is written to disk.
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Correct Answer: A
Correct Answer: A
https://www.flackbox.com/netapp-wafl-nvram-system-memory-cache
https://bitpushr.wordpress.com/category/performance/
The client writes some data
Write arrives in controller’s RAM and is copied into controller’s NVRAM
Write is then mirrored into partner’s NVRAM
When the partner NVRAM acknowledges the write, the client receives an acknowledgement that the data has been written [to disk]
A consistency point occurs and the data (incl. parity) is written to disk