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By default, each OneDrive for Business site is allocated 1 TB of storage space for its use. Some sites however may be more actively used or may contain more files than the rest; such sites may hence utilize more storage. To identify such sites, use the ODBSiteUsageTest.

This test monitors the activities of sites and reports how this demand impacts storage usage across sites. Detailed diagnostics reveals those sites with a high level of activity. Additionally, the test also looks for sites that are using more than a configured percentage of storage space allocated to them, and reports the count of such sites (if any). Detailed metrics will point you to the exact sites that are using up storage resources excessively. With the help of the detailed metrics, you can correlate the load on the individual sites with their storage allocation and usage. In the process, you can figure out if any site requires additional storage space to handle its current demand.

Outputs of the test: One set of results for the Office 365 tenant being monitored.

Measurement	Description	Measurement Unit	Interpretation
Total_sites	Indicates the total number of sites for this tenant on OneDrive for Business.	Number
Active_sites	Indicates the number of active sites.	Number	An active site is a OneDrive for Business site that has seen some activity in terms of page views, page visits, or any file activity (eg., creation, modification, deletion). To view the sites that were active recently, use the detailed diagnosis of this measure.
Active_site_percent	Indicates what percentage of total sites is active.	Percent	A high value of this measure indicates that the tenant is accessing or working with OneDrive files very frequently.
Inactiv_sites	Indicates the number of sites that are inactive beyond the number of days configured against the Inactive Days parameter.	Number	A high value for this measure indicates that many sites are inactive. Administrators can drill down the detailed diagnosis of this measure to identify the active sites and remove them as and when, necessary.
Orph_sites	Indicates the total number of orphaned sites.		Orphaned sites are those sites that are deleted from the authentication provider (such as removed from Active users page in the Microsoft 365 admin center when user leaves the organization), and still continue to exist in OneDrive for Business! These sites should be identified and cleaned up (if exists) to avoid a highly risky situation for the security of sensitive data. Use the detailed diagnosis of this measure to know the list of orphaned sites on this tenant.
Strg_limit	Indicates the number of sites that are utilizing the allocated storage resources excessively.	Number	A high value for this measure is a cause for concern. The value of this measure will be incremented by 1 if the percent storage usage of any site is more than the percentage configured against the Storage Limit parameter. Ideally, the value of this measure should be 0. A non-zero value indicates that one/more web sites are over-utilizing the storage space allocated to them. To know which sites they are, use the detailed diagnosis of this measure.
Strgusd_site	Indicates the amount of storage currently used across sites.	GB
Strgalctd_site	Indicates the total amount of storage space allocated across sites.	GB
Strg_used	Indicates the percentage of allocated storage that is currently in use across sites.	Percent	A value close to 100% indicates a probable storage space crunch, owing to excessive space usage by one/more sites. In such a situation, use the detailed diagnosis of the Sites nearing allocated storage measure to know which sites are hogging storage resources.