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The QuotaScan job updates quota accounting for domains created on an existing directory path. Although the job is typically run without any intervention, the administrator has the option of manually controlling it if necessary or preferred. By default, QuotaScan runs with a “low” impact policy and a low-priority value of 6.
If quotas are created on empty directories, governance will instantaneously propagate from parent to child incrementally. If the directory is not empty, the QuotaScan job is used to update the governance.
A domain that is created on a nonempty directory will not be marked as ready, which triggers a QuotaScan job to be started. QuotaScan is run by the OneFS job engine and is subject to the general scheduling and prioritization of jobs. The QuotaScan performs a tree walk to traverse the directory tree under the domain root.
The QuotaScan job is the cluster maintenance process responsible for scanning the cluster, and performing accounting activities to bring the determined governance to each inode. In essence, the job is a distributed tree walk that is performed based on the state of the domain.
For more information about the job engine, see the OneFS Job Engine white paper.