According to this Microsoft article, caching is not recommended on disks hosting SQL/Server log files. If the workload is heavily utilizing the underlying disks (any other application than SQL/Server), disk caching should also be set to none.
Please refer to https://stackoverflow.com/questions/39623778/why-do-best-practices-tell-you-to-disable-caching-on-the-log-drive-of-sql-server for more information.
To change the value:
- Go to the specific instance
- Select disks
- Click on the name of the data disk
- Change host caching to the specific value
- Click save
When tested on both cluster nodes with large numbers of files copied onto a 100GB volume, no degradation was detected. We also performed switchovers and paused and continued the mirror and no degradation was detected.