Red Hat CLUSTER SUITE - CONFIGURING AND MANAGING A CLUSTER 2006 Guide d'installation télécharger pdf (Page 32)

22 Chapter 1. Red Hat Cluster Suite Overview

1.7. 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. 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.

Figure 1-18. GNBD Overview

1.8. Linux Virtual Server

Linux Virtual Server (LVS) is a set of integrated software components for balancing the IP

load across a set of real servers. LVS runs on a pair of equally conﬁgured computers: one

that is an active LVS router and one that is a backup LVS router. The active LVS router

serves two roles:

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