z/VM DCSS device driver
The z/VM® discontiguous saved segments (DCSS) device driver provides disk-like fixed block access to z/VM discontiguous saved segments.
In particular, the DCSS device driver facilitates implementing a read-write RAM disk that can be shared among multiple Linux® instances that run as guests of the same z/VM system. For example, such a RAM disk can provide a shared file system.
For information about DCSS, see z/VM: Saved Segments Planning and Administration, SC24-6322