Red Hat ENTERPRISE LINUX 5 - GLOBAL NETWORK BLOCK DEVICE Manuale Utente Scaricare il pdf (Pagina 10)

Chapter 3. GNBD Driver and

Command Usage

The Global Network Block Device (GNBD) driver allows a node to export its local storage as a

GNBD over a network so that other nodes on the network can share the storage. Client nodes

importing the GNBD use it like any other block device. Importing a GNBD on multiple clients

forms a shared storage configuration through which GFS can be used.

The GNBD driver is implemented through the following components.

• gnbd_serv — Implements the GNBD server. It is a user-space daemon that allows a node to

export local storage over a network.

• gnbd.ko — Implements the GNBD device driver on GNBD clients (nodes using GNBD

devices).

Two user commands are available to configure GNBD:

• gnbd_export (for servers) — User program for creating, exporting, and managing GNBDs on

a GNBD server.

•

gnbd_import (for clients) — User program for importing and managing GNBDs on a GNBD

client.

1. Exporting a GNBD from a Server

The gnbd_serv daemon must be running on a node before it can export storage as a GNBD. You

can start the gnbd_serv daemon running gnbd_serv as follows:

#gnbd_serv

gnbd_serv: startup succeeded

Once local storage has been identified to be exported, the gnbd_export command is used to ex-

port it.

Note

When you configure GNBD servers with device-mapper multipath, you must not

use page caching. All GNBDs that are part of a logical volume must run with cach-

ing disabled. By default, the gnbd_export command exports with caching turned off.

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Red Hat ENTERPRISE LINUX 5 - GLOBAL NETWORK BLOCK DEVICE Manuale Utente Pagina 10