53 lines
1.9 KiB
ReStructuredText
53 lines
1.9 KiB
ReStructuredText
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.. SPDX-License-Identifier: GPL-2.0
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====================
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Global File System 2
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====================
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GFS2 is a cluster file system. It allows a cluster of computers to
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simultaneously use a block device that is shared between them (with FC,
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iSCSI, NBD, etc). GFS2 reads and writes to the block device like a local
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file system, but also uses a lock module to allow the computers coordinate
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their I/O so file system consistency is maintained. One of the nifty
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features of GFS2 is perfect consistency -- changes made to the file system
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on one machine show up immediately on all other machines in the cluster.
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GFS2 uses interchangeable inter-node locking mechanisms, the currently
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supported mechanisms are:
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lock_nolock
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- allows GFS2 to be used as a local file system
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lock_dlm
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- uses the distributed lock manager (dlm) for inter-node locking.
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The dlm is found at linux/fs/dlm/
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lock_dlm depends on user space cluster management systems found
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at the URL above.
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To use GFS2 as a local file system, no external clustering systems are
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needed, simply::
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$ mkfs -t gfs2 -p lock_nolock -j 1 /dev/block_device
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$ mount -t gfs2 /dev/block_device /dir
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The gfs2-utils package is required on all cluster nodes and, for lock_dlm, you
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will also need the dlm and corosync user space utilities configured as per the
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documentation.
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gfs2-utils can be found at https://pagure.io/gfs2-utils
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GFS2 is not on-disk compatible with previous versions of GFS, but it
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is pretty close.
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The following man pages are available from gfs2-utils:
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============ =============================================
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fsck.gfs2 to repair a filesystem
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gfs2_grow to expand a filesystem online
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gfs2_jadd to add journals to a filesystem online
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tunegfs2 to manipulate, examine and tune a filesystem
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gfs2_convert to convert a gfs filesystem to GFS2 in-place
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mkfs.gfs2 to make a filesystem
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============ =============================================
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