Red Hat GFS 6.0 Administrator's Manual page 140

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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 (
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 pool devices.
3. GFS must be run on top of a pool device, not raw devices.
Chapter 11. Using GNBD
command) other GNBD
gnbd_import