config GFS2_FS tristate "GFS2 file system support" depends on EXPERIMENTAL select FS_POSIX_ACL select CRC32 help A cluster filesystem. Allows a cluster of computers to simultaneously use a block device that is shared between them (with FC, iSCSI, NBD, etc...). GFS reads and writes to the block device like a local filesystem, but also uses a lock module to allow the computers coordinate their I/O so filesystem consistency is maintained. One of the nifty features of GFS is perfect consistency -- changes made to the filesystem on one machine show up immediately on all other machines in the cluster. To use the GFS2 filesystem, you will need to enable one or more of the below locking modules. Documentation and utilities for GFS2 can be found here: http://sources.redhat.com/cluster config GFS2_FS_LOCKING_NOLOCK tristate "GFS2 \"nolock\" locking module" depends on GFS2_FS help Single node locking module for GFS2. Use this module if you want to use GFS2 on a single node without its clustering features. You can still take advantage of the large file support, and upgrade to running a full cluster later on if required. If you will only be using GFS2 in cluster mode, you do not need this module. config GFS2_FS_LOCKING_DLM tristate "GFS2 DLM locking module" depends on GFS2_FS && SYSFS && NET && INET && (IPV6 || IPV6=n) select IP_SCTP if DLM_SCTP select CONFIGFS_FS select DLM help Multiple node locking module for GFS2 Most users of GFS2 will require this module. It provides the locking interface between GFS2 and the DLM, which is required to use GFS2 in a cluster environment.