StorNext File System Thin Provisioned Capabilities

With thin provisioned storage, you may need the ability to unmap space on storage. For example, if the space is over-provisioned and shared by multiple devices, it could be “over-allocated” and writes to the storage fail, even though the storage and corresponding file system claim there is available space. This usually occurs when the actual storage space is completely mapped; the storage maps the space when it is written and it is never unmapped without intervention by the file system or the administrator. When files are removed, the space is not unmapped by StorNext versions prior to StorNext 6.

StorNext 6 provides two file system level mechanisms that unmap free space in the file system

Note: This functionality is available on Linux MDCs and with the QXS series storage. Quantum recommends you not over-provision your StorNext volumes.