Add desc of new TiFlash storage settings and guidelines for upgrading in v4.0.9 (#4965) #5150
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cherry-pick #4965 to release-4.0
Signed-off-by: JaySon-Huang tshent@qq.com
What is changed, added or deleted? (Required)
In v4.0.9, TiFlash supports new configurations for better performance when it is deployed on multi-disk node.
This PR
Please do NOT merge this PR until v4.0.9 is ready for release~
Which TiDB version(s) do your changes apply to? (Required)
What is the related PR or file link(s)?
Do your changes match any of the following descriptions?