OCFS2

The Oracle Cluster File System (OCFS, in its second version OCFS2) is a <a href="/facts/Shared_disk_file_system/Bz61f7Ce">shared disk file system</a> developed by <a href="/facts/Oracle_Corporation/0z14FygH">Oracle Corporation</a> and released under the <a href="/facts/GNU_General_Public_License/S75KhLSX">GNU General Public License</a>.
The first version of OCFS was developed with the main focus to accommodate Oracle's <a href="/facts/Database_management_system/VYcpkevb">database management system</a> that used <a href="/facts/Cluster_computing/mT7S1BcX">cluster computing</a>. Because of that it was not a <a href="/facts/POSIX/mQkSt234">POSIX</a>-compliant file system. With version 2 the POSIX features were included.
OCFS2 (version 2) was integrated into the version 2.6.16 of <a href="/facts/Linux_(kernel)/dlkduHuA">Linux kernel</a>. Initially, it was marked as "experimental" (<a href="/facts/Software_release_life_cycle/z4Q4RElA">Alpha-test</a>) code. This restriction was removed in Linux version 2.6.19. With kernel version 2.6.29 in late 2008, more features were included into ocfs2, such as <a href="/facts/Access_control_list/t38J9Vao">access control lists</a> and quotas.
OCFS2 used a <a href="/facts/Distributed_lock_manager/CGvJQHH9">distributed lock manager</a> which resembles the <a href="/facts/OpenVMS/rAnHAgpD">OpenVMS</a> DLM but is much simpler.
Oracle announced version 1.6 in November 2010 which included a <a href="/facts/Copy_on_write/Vz5V8uMX">copy on write</a> feature called reflink.

OCFS2 open-in-new

OCFS2