Enabling auto expansion of SQL Server mount volumes

Delphix now supports auto expansion of the NTFS mount volumes beyond 63 TB up to 255 TB. The MSSQL_EXPAND_VOLUME_BEYOND_63TB parameter automates the expansion of mount volumes once the storage threshold (default 90%) is reached.  

If the MSSQL_EXPAND_VOLUME_BEYOND_63TB parameter is disabled, job warnings and faults are shown for the dSources and VDBs whose threshold is reached or exceeded. Delphix will detect when an object’s size has reached or exceeded the storage threshold of Delphix provided NTFS mount volume volume during environment monitoring and respective warnings and faults will be raised. Once you see any such warning or fault, enable the MSSQL_EXPAND_VOLUME_BEYOND_63TB parameter and the respective dSources and VDBs will be automatically expanded during the next operation which involves mounting volumes such as linking, sync, enable and other dSource and VDB operations. 

Note: Volumes larger than 63 TB may not be compatible with certain services and applications, which could be using VSS (Volume Shadow Copy Service), especially if you are not utilizing a SAN or RAID enclosure. Refer to the Usability limit for Volume Shadow Copy Service (VSS) page for more details. 

Once mount volume is expanded for a source, shrinking the size of the mounted volume is not allowed. So, enable the MSSQL_EXPAND_VOLUME_BEYOND_63TB parameter after carefully considering the impact of this on compatibility with certain applications.

To enable or disable the MSSQL_EXPAND_VOLUME_BEYOND_63TB feature using CLI, read the CLI cookbook: enabling/disabling the MSSQL_EXPAND_VOLUME_BEYOND_63TB parameter page.