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Figure 1.17. Creating Logical Volumes

7. Global Network Block Device

Global Network Block Device (GNBD) provides block-device access to Red Hat GFS over

TCP/IP. GNBD is similar in concept to NBD; however, GNBD is GFS-specific and tuned solely

for use with GFS. GNBD is useful when the need for more robust technologies — Fibre Channel

or single-initiator SCSI — are not necessary or are cost-prohibitive.

GNBD consists of two major components: a GNBD client and a GNBD server. A GNBD client

runs in a node with GFS and imports a block device exported by a GNBD server. A GNBD

server runs in another node and exports block-level storage from its local storage (either directly

attached storage or SAN storage). Refer to Figure 1.18, “GNBD Overview”. Multiple GNBD

clients can access a device exported by a GNBD server, thus making a GNBD suitable for use

by a group of nodes running GFS.

Global Network Block Device

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