Red Hat ENTERPRISE LINUX 5 DM MULTIPATH Configuration And Administration Manual

Chapter 4. The DM-Multipath Configuration File18Attribute DescriptionA value of queue indicates that queuing should not stop until thepath is fixed.flush_on_last_del (RHEL 5.3 and later) If set to yes, the multipathd daemon willdisable queueing when the last path to a device has been deleted.The default value is no.rr_min_io Specifies the number of I/O requests to route to a path beforeswitching to the next path in the current path group.mode (RHEL 5.3 and later) The mode to use for the multipath devicenodes, in octal. The default value is determined by the process.uid (RHEL 5.3 and later) The user ID to use for the multipath devicenodes. You must use the numeric user ID. The default value isdetermined by the process.gid (RHEL 5.3 and later) The group ID to use for the multipath devicenodes. You must use the numeric group ID. The default value isdetermined by the process.Table 4.2. Multipath AttributesThe following example shows multipath attributes specified in the configuration file for two specificmultipath devices. The first device has a WWID of 3600508b4000156d70001200000b0000 and asymbolic name of yellow.The second multipath device in the example has a WWID of 1DEC_____321816758474 and asymbolic name of red. In this example, the rr_weight attributes is set to priorities.multipaths {multipath {wwid 3600508b4000156d70001200000b0000alias yellowpath_grouping_policy multibuspath_checker readsector0path_selector "round-robin 0"failback manualrr_weight prioritiesno_path_retry 5}multipath {wwid 1DEC_____321816758474alias redrr_weight priorities}}4.5. Configuration File DevicesTable 4.3, “Device Attributes” shows the attributes that you can set for each individual storage devicein the devices section of the multipath.conf configuration file. These attributes are used by DM-Multipath unless they are overwritten by the attributes specified in the multipaths section of the