Red Hat GFS 6.0 -, Руководство администратора

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2 Chapter 1. Red Hat GFS Overview
•
Initial-configuration druid via Red Hat Cluster Suite — When GFS is installed with Red Hat Cluster
Suite, a configuration druid is available with Cluster Suite for initial configuration of GFS. For more
information about the druid, refer to the Cluster Suite documentation.
New and Changed Features with Red Hat GFS 6.0 for Red Hat Enterprise Linux 3 Update 5
•
Enhanced
gfs_fsck
performance and changes to the
gfs_fsck
command — The
gfs_fsck
function performs 10 times as fast as
gfs_fsck
in releases earlier than Red Hat GFS 6.0 for Red
Hat Enterprise Linux 3 Update 5. In addition, the enhanced
gfs_fsck
function includes changes
to certain command options. For more information about changes to the command options, refer to
Section 9.12 Repairing a File System .
•
Optional
usedev
key available for use with the
nodes.ccs
file (
nodes.ccs:nodes
) — The
value of the
usedev
key is a named device from the
ip_interfaces
section. If
usedev
is
present, GULM uses the IP address from that device in the
ip_interfaces
section. Otherwise
GULM uses the IP address from
libresolv
, as it does in releases earlier than Red Hat GFS 6.0
for Red Hat Enterprise Linux 3 Update 5. For more information about the
usedev
key, refer to
Section 6.7 Creating the
nodes.ccs
File
For information about using GFS with Red Hat Cluster Suite, refer to
Appendix A Using Red Hat GFS with Red Hat Cluster Suite . For GFS upgrade instructions, refer to
Appendix B Upgrading GFS .
1.2. Performance, Scalability, and Economy
You can deploy GFS in a variety of configurations to suit your needs for performance, scalability,
and economy. For superior performance and scalability, you can deploy GFS in a cluster that is
connected directly to a SAN. For more economical needs, you can deploy GFS in a cluster that is
connected to a LAN with servers that use GNBD (Global Network Block Device). A GNBD pro-
vides block-level storage access over an Ethernet LAN. (For more information about GNBD, refer to
Chapter 11 Using GNBD .)
The following sections provide examples of how GFS can be deployed to suit your needs for perfor-
mance, scalability, and economy:
•
Section 1.2.1 Superior Performance and Scalability
•
Section 1.2.2 Performance, Scalability, Moderate Price
•
Section 1.2.3 Economy and Performance
Note
The deployment examples in this chapter reflect basic configurations; your needs might require a
combination of configurations shown in the examples.
1.2.1. Superior Performance and Scalability
You can obtain the highest shared-file performance when applications access storage directly. The
GFS SAN configuration in Figure 1-1 provides superior file performance for shared files and file
systems. Linux applications run directly on GFS clustered application nodes. Without file protocols
or storage servers to slow data access, performance is similar to individual Linux servers with direct-
connect storage; yet, each GFS application node has equal access to all data files. GFS supports over
300 GFS application nodes.