udev_dir | Specifies the directory where udev device nodes are created. The default value is /udev. |
polling_interval | Specifies the interval between two path checks in seconds. The default value is 5. |
selector | Specifies the default algorithm to use in determining what path to use for the next I/O operation. The default value is round-robin 0. |
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 | The default value is failover. |
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getuid_callout | Specifies the default program and arguments to call out to obtain a unique path identifier. An absolute path is required.
The default value is /sbin/scsi_id -g -u -s. |
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prio_callout | Specifies the default program and arguments to call out to obtain a path priority value. For example, the ALUA bits in SPC-3 provide an exploitable prio value for example. "none" is a valid value. The default value is no callout, indicating all paths are equal |
features | Specifies the default extra features of multipath devices. The only existing feature is queue_if_no_path. The default value is (null). |
path_checker | Specifies the default method used to determine the state of the paths. Possible values include: readsector0, tur, emc_clariion, hp_sw, and directio. The default value is readsector0. |
failback | Specifies path group failback.
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. |
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rr_min_io | Specifies the number of I/O requests to route to a path before switching to the next path in the current path group. The default value is 1000. |
max_fds | (RHEL 4.7 and later) Sets the maximum number of open file descriptors for the multipathd process. A value of max sets the number of open file descriptors to the system maximum. |
rr_weight | If set to priorities, then instead of sending rr_min_io requests to a path before calling selector to choose the next path, the number of requests to send is determined by rr_min_io times the path's priority, as determined by the prio_callout program. Currently, there are priority callouts only for devices that use the group_by_prio path grouping policy, which means that all the paths in a path group will always have the same priority.
If set to uniform, all path weights are equal. The default value is uniform. |
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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. | | The default value is (null). |
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flush_on_last_del | (RHEL 4.7 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. |
user_friendly_names | If set to yes, specifies that the system should using the bindings file /var/lib/multipath/bindings to assign a persistent and unique alias to the multipath, in the form of mpathn. 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 | (RHEL 4.6 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 | (RHEL 4.7 and later) The mode to use for the multipath device nodes, in octal. The default value is determined by the process. |
uid | (RHEL 4.7 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 | (RHEL 4.7 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. |
