Red Hat GFS 6.1 -, Administrator'S Manual

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62 Chapter 6. Using GNBD with Red Hat GFS
6.2. Running GFS on a GNBD Server Node
You can run GFS on a GNBD server node, with some restrictions. In addition, running
GFS on a GNBD server node reduces performance. The following restrictions apply when
running GFS on a GNBD server node.
Important
When running GFS on a GNBD server node you must follow the restrictions listed; other-
wise, the GNBD server node will fail.
1. A GNBD server node must have local access to all storage devices needed to mount a
GFS file system. The GNBD server node must not import (
gnbd_import
command)
other GNBD devices to run the file system.
2. The GNBD server must export all the GNBDs in uncached mode, and it must export
the raw devices, not logical volume devices.
3. GFS must be run on top of a logical volume device, not raw devices.
Note
You may need to increase the timeout period on the exported GNBDs to accommodate
reduced performance. The need to increase the timeout period depends on the quality of
the hardware.