Red Hat GNBD WITH GLOBAL FILE SYSTEM IN RHEL 4.5 Installationsanleitung PDF herunterladen (Seite 29)

Multipaths Device Configuration Attributes

Attribute Description

the sum of the priorities of the included paths. The default value is

sum.

log_checker_err (Red Hat Enterprise Linux 5.6 and later) If set to once, a path

checker error is logged once at logging level 2 and any later errors

are logged at level 3 until the device is restored. If set to always,

every path checker error is logged at logging level 2. The default

value is always.

fast_io_fail_tmo (Red Hat Enterprise Linux 5.7 and later) The number of seconds

the SCSI layer will wait after a problem has been detected on an

FC remote port before failing I/O to devices on that remote port.

This value should be smaller than the value of dev_loss_tmo.

Setting this to off will disable the timeout. The default value is

determined by the OS.

dev_loss_tmo (Red Hat Enterprise Linux 5.7 and later) The number of seconds

the SCSI layer will wait after a problem has been detected on an

FC remote port before removing it from the system. The default

value is determined by the OS.

file_timeout (Red Hat Enterprise Linux 5.7 and later) The number of seconds

multipath will wait for a necessary file to appear while setting up a

multipath device. The default value is 90.

4.4. Multipaths Device Configuration Attributes

Table 4.2, “Multipath Attributes” shows the attributes that you can set in the multipaths section of

the multipath.conf configuration file for each specific multipath device. These attributes apply only

to the one specified multipath. These defaults are used by DM-Multipath and override attributes set in

the defaults and devices sections of the multipath.conf file.

Table 4.2. Multipath Attributes

Attribute Description

wwid Specifies the WWID of the multipath device to which the

multipath attributes apply.

alias Specifies the symbolic name for the multipath device to which the

multipath attributes apply.

path_grouping_policy Specifies the default path grouping policy to apply to unspecified

multipaths. Possible values include:

failover = 1 path per priority group

multibus = all valid paths in 1 priority group

group_by_serial = 1 priority group per detected serial number

group_by_prio = 1 priority group per path priority value

group_by_node_name = 1 priority group per target node name

prio_callout Specifies the default program and arguments to call out to obtain

a path weight. Weights are summed for each path group to

determine the next path group to use in case of failure. "none" is a

valid value.

path_selector Specifies the default algorithm to use in determining what path to

use for the next I/O operation.

failback Specifies path group failback.

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