Red Hat GNBD WITH GLOBAL FILE SYSTEM IN RHEL 4.5 Guida di Installazione Scaricare il pdf (Pagina 28)

Chapter 4. The DM-Multipath Configuration File

Attribute Description

A value of 0 or immediate specifies that as soon as there is a

path group with a higher priority than the current path group the

system switches to that path group.

A numeric value greater than zero specifies deferred failback,

expressed in seconds.

A value of manual specifies that failback can happen only with

operator intervention.

The default value is manual.

no_path_retry A numeric value for this attribute specifies the number of times

the system should attempt to use a failed path before disabling

queueing.

A value of fail indicates immediate failure, without queuing.

A value of queue indicates that queuing should not stop until the

path is fixed.

flush_on_last_del (Red Hat Enterprise Linux 5.3 and later) If set to yes, the

multipathd daemon will disable queueing when the last path to

a device has been deleted. The default value is no.

queue_without_daemon (Red Hat Enterprise Linux 5.3 and later) If set to no, the

multipathd daemon will disable queueing for all devices when it

is shut down. The default value is yes.

user_friendly_names If set to yes, specifies that the system should using the bindings

file to assign a persistent and unique alias to the multipath, in the

form of mpathn. The default location of the bindings file is /

var/lib/multipath/bindings, but this can be changed with

the bindings_file option. If set to no, specifies that the system

should use use the WWID as the alias for the multipath. In either

case, what is specified here will be overridden by any device-

specific aliases you specify in the multipaths section of the

configuration file. The default value is no.

bindings_file (Red Hat Enterprise Linux 5.2 and later) The location of the

bindings file that is used with the user_friendly_names

option. The default value is /var/lib/multipath/bindings.

mode (Red Hat Enterprise Linux 5.3 and later) The mode to use for the

multipath device nodes, in octal. The default value is determined

by the process.

uid (Red Hat Enterprise Linux 5.3 and later) The user ID to use for the

multipath device nodes. You must use the numeric user ID. The

default value is determined by the process.

gid (Red Hat Enterprise Linux 5.3 and later) The group ID to use for

the multipath device nodes. You must use the numeric group ID.

The default value is determined by the process.

checker_timeout (Red Hat Enterprise Linux 5.5 and later) The timeout value to

use for path checkers that issue SCSI commands with an explicit

timeout, in seconds. The default value is taken from sys/block/

sdx/device/timeout.

pg_prio_calc (Red Hat Enterprise Linux 5.6 and later) If set to avg, sets the

priority of path groups to the average of the priorities of the

included paths. If set to sum, sets the priority of path groups to

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Red Hat GNBD WITH GLOBAL FILE SYSTEM IN RHEL 4.5 Guida di Installazione Pagina 28

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