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Chapter 1. GFS Overview
4. Before Setting Up GFS
Before you install and set up GFS, note the following key characteristics of your GFS file
systems:
GFS nodes
Determine which nodes in the Red Hat Cluster Suite will mount the GFS file systems.
Number of file systems
Determine how many GFS file systems to create initially. (More file systems can be added
later.)
File system name
Determine a unique name for each file system. Each file system name is required in the
form of a parameter variable. For example, this book uses file system names
in some example procedures.
mydata2
File system size
GFS is based on a 64-bit architecture, which can theoretically accommodate an 8 EB file
system. However, the current supported maximum size of a GFS file system is 25 TB. If
your system requires GFS file systems larger than 25 TB, contact your Red Hat service
representative.
When determining the size of your file system, you should consider your recovery needs.
Running the
fsck
a large amount of memory. Additionally, in the event of a disk or disk-subsytem failure,
recovery time is limited by the speed of your backup media.
Journals
Determine the number of journals for your GFS file systems. One journal is required for
each node that mounts a GFS file system. Make sure to account for additional journals
needed for future expansion, as you cannot add journals dynamically to a GFS file system.
GNBD server nodes
If you are using GNBD, determine how many GNBD server nodes are needed. Note the
hostname and IP address of each GNBD server node for setting up GNBD clients later. For
information on using GNBD with GFS, see the Using GNBD with Global File System
document.
Storage devices and partitions
Determine the storage devices and partitions to be used for creating logical volumes (via
CLVM) in the file systems.
6
command on a very large file system can take a long time and consume
and
mydata1
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