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 |
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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. | 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. |
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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. |
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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 queueing. | A value of queue indicates that queueing should not stop until the path is fixed. |
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user_friendly_names | If set to yes, specifies that the system should use the /etc/multipath/bindings file 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 with the alias attribute for a specific multipath device. |
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. |
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. |
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. |
