Novell LINUX ENTERPRISE SERVER 10 - INSTALLATION AND ADMINISTRATION 11-05-2007, Installation Manual

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Description and Recommendation OCFS2 Pa-
rameter
Cluster size is the smallest unit of space allocated to a file to
hold the data. Cluster size
Options are 4, 8, 16, 32, 64, 128, 256, 512, and 1024 KB. Cluster
size cannot be modified after the volume is formatted.
Oracle recommends a cluster size of 128 KB or larger for
database volumes. Oracle also recommends a cluster size of 32
or 64 KB for Oracle Home.
The maximum number of nodes that can concurrently mount a
volume. On mounting, OCFS2 creates separate system files, Number of
node slots
such as the journals, for each of the nodes. Nodes that access
the volume can be a combination of little-endian architectures
(such as x86, x86-64, and ia64) and big-endian architectures
(such as ppc64 and s390x).
Node-specific files are referred to as local files. A node slot
number is appended to the local file. For example: journal:0000
belongs to whatever node is assigned to slot number 0.
Set each volume’s maximum number of node slots when you
create it, according to how many nodes that you expect to con-
currently mount the volume. Use the
tunefs.ocfs2
utility
to increase the number of node slots as needed; the value cannot
be decreased.
The smallest unit of space addressable by the file system.
Specify the block size when you create the volume. Block size
Options are 512 bytes (not recommended), 1 KB, 2 KB, or 4
KB (recommended for most volumes). Block size cannot be
modified after the volume is formatted.
278 Installation and Administration