Distributed Lock Manager is a Linux kernel patch developed by Red Hat as part of their Linux clustering technology. Its programming API is very similar to those found on other operating systems, but is modeled most closely on VMS.

A lock manager that runs on different systems in a cluster, and ensures consistent access to distributed resources.

(DLM) (n.) The locking software that is used in a shared disk Oracle Parallel Server (OPS) environment. The DLM enables Oracle processes that are running on different nodes to synchronize database access. The DLM is designed for high availability. If a process or node crashes, the remaining nodes do not have to be shut down and restarted. A quick reconfiguration of the DLM is performed to recover from such a failure.