Red Hat ENTERPRISE LINUX 5 - GLOBAL NETWORK BLOCK DEVICE Manuale Utente Scaricare il pdf (Pagina 11)

Note

A server should not import the GNBDs to use them as a client would. If a server

exports the devices uncached, the underlying devices may also be used by gfs.

Usage

gnbd_export -dpathname-egnbdname [-c][-u][-U

pathname

Specifies a storage device to export.

gnbdname

Specifies an arbitrary name selected for the GNBD. It is used as the device name on GNBD

clients. This name must be unique among all GNBDs exported in a network.

-o

Export the device as read-only.

-c

Enable caching. Reads from the exported GNBD and takes advantage of the Linux page

cache.

By default, the gnbd_export command does not enable caching.

Note

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

cify the -c option. All GNBDs that are part of a logical volume must run with

caching disabled.

Note

If you have been using GFS 5.2 or earlier and do not want to change your GN-

BD setup you should specify the -c option. Before GFS Release 5.2.1, Linux

caching was enabled by default for gnbd_export. If the -c option is not spe-

cified, GNBD runs with a noticeable performance decrease. Also, if the -c op-

tion is not specified, the exported GNBD runs in timeout mode, using the de-

fault timeout value (the -t option). For more information about the gnbd_export

command and its options, refer to the gnbd_export man page.

-uuid

Manually sets the Universal Identifier for an exported device. This option is used with -e.

Usage

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Red Hat ENTERPRISE LINUX 5 - GLOBAL NETWORK BLOCK DEVICE Manuale Utente Pagina 11