Content deleted Content added
→Lock Modes: use table headers |
|||
Line 5:
Combining two or more computers into a [[computer cluster|cluster]] in which the machines can use each other's hard disks via a unified file system offers significant advantages for performance and [[high-availability|availability]]. DLMs have been used as the foundation for clustered file systems with considerable success by using cluster wide locks not only for [[file locking]] but also for coordination of all disk access. [[VMScluster]], the first clustering system to come into widespread use, relied on the [[OpenVMS]] DLM in just this way.
[[Red Hat]] and [[Oracle Corporation|Oracle]] have both developed clustering software for [[Linux]]. Both projects include a DLM modelled on the venerable [[OpenVMS|VMS]] DLM. (''OCFS2'', the Oracle Cluster File System[http://oss.oracle.com/projects/ocfs2/] has been included[http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=29552b1462799afbe02af035b243e97579d63350] in version 2.6.16 of the official [[Linux kernel]]. Red Hat's cluster software[http://sources.redhat.com/cluster/], including their DLM[http://sources.redhat.com/cluster/dlm/] is available as a kernel patch and will be included in version 2.6.19)
==VMS Implementation==
| |||