Red Hat GFS 5.2.1 -, Administrator'S Manual

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Appendix B. Basic GFS Examples 139
Major Minor #Blocks Name
8 16 8388608 sda
8 17 8001 sda1
8 18 8377897 sda2
8 32 8388608 sdb
8 33 8388608 sdb1
Table B-7. Storage Device Information
Notes
For shared storage devices to be visible to the nodes, it may be necessary to load an appropriate
device driver. If the shared storage devices are not visible on each node, confirm that the device
driver is loaded and that it loaded without errors.
The small partition (
/dev/sda1
) is used to store the cluster configuration information. The two re-
maining partitions (
/dev/sda2
,
sdb1
) are used for the GFS file systems.
You can display the storage device information at each node in your GFS cluster by running the follow-
ing command:
cat /proc/partitions
. Depending on the hardware configuration of the GFS nodes,
the names of the devices may be different on each node. If the output of the
cat /proc/partitions
command shows only entire disk devices (for example,
/dev/sda
instead of
/dev/sda1
), then the
storage devices have not been partitioned. If you need to partition a device, use the
fdisk
com-
mand.
B.2.2. Prerequisites
The prerequisites for this example are as follows:
•
Kernel installed
•
GFS RPM installed
•
GFS kernel modules loaded
B.2.2.1. Kernel Installed
An appropriate kernel must be installed and running on each node. Refer to Section 3.2.1 Installing a
Linux Kernel for more information about installing a Linux kernel.
B.2.2.2. GFS RPM Installed
The GFS RPMs must be installed, and all GFS commands, daemons and fencing agents must be
accessible via root’s search path.