Is the maximum amount of data that can be held in the writeback cache 60MB per file? And if I have 100 files being written to the writeback cache, will the amount of data that can be cached for writes be 6GB?

[kanitani]

Page URL

https://docs.netapp.com/us-en/ontap/flexcache-writeback/flexcache-write-back-architecture.html

Page title

FlexCache write-back architecture

Summary

I would like the manual to be more specific. The questions I have are listed below.

> ONTAP employs a dirty data record system to keep track of dirty data per file

I understand that dirty data record (=DDR) exists on a file-by-file basis. Then,

> When a file is actively being written, ONTAP will start flushing dirty data back after two DDRs have been filled and the third DDR is being written

If there are three 20MB DDRs for particular file, does that mean that a maximum of 60MB can be cached per file? (Because if the bandwidth is narrow and there is a delay in flushing to the origin, it may be slow to write the first 40MB DDR back to the origin. Therefore, up to 60MB of data per file may be temporarily stored in the cache, right?)

And if 100 files are written to the writeback cache, does that mean the maximum amount of data that can be cached for writes is 6GB?

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