[Feature] Set Dirty Background Ratio and Dirty Ratio from the CSI Driver

[danieljkeeler]

Is your feature request related to a problem? Please describe.
My customer, Reed Elsevier, has been running into some issues with write errors to the mounted storage accounts in their AKS clusters. We have been working with support, GBB, and storage PG resources to try and solve where the write failure is occurring. One of the things storage PG was recommending was to attempt to change the dirty background ratio (vm.dirty_background_ratio) and dirty ratio (vm.dirty_ratio) and perform more tests. Since this isn’t something that can be changed through the CSI Driver they need to take an outage every time they want to make a change to perform another test.

Describe the solution you'd like
The abillity to change the dirty background ratio (vm.dirty_background_ratio) and dirty ratio (vm.dirty_ratio) from the CSI Driver.

Describe alternatives you've considered
The customer is able to make these changes today but they require an outage to make the change. Also, trying to tune their workload to the appropriate settings so this isn't an ongoing issue.

Additional context
Add any other context or screenshots about the feature request here.

[microsoft-github-policy-service]

@azure/azure-container-storage-team would you be able to assist?

[microsoft-github-policy-service]

@VyabaRamadoss, @AllenWen-at-Azure would you be able to assist?

[andyzhangx]

this is a VM setting, I think cx could write a daemonset to change that setting. here is an example to change other settings on the vm: https://github.com/andyzhangx/demo/blob/master/aks/support-cifs-aes-256-gcm.yaml