Chapter 4. The DM-Multipath Configuration File
18
Attribute
Description
A value of
queue
indicates that queuing should not stop until the
path is fixed.
flush_on_last_del
(RHEL 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
.
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
(RHEL 5.3 and later) The mode to use for the multipath device
nodes, in octal. The default value is determined by the process.
uid
(RHEL 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
(RHEL 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.
Table 4.2. Multipath Attributes
The following example shows multipath attributes specified in the configuration file for two specific
multipath devices. The first device has a WWID of
3600508b4000156d70001200000b0000
and a
symbolic name of
yellow
.
The second multipath device in the example has a WWID of
1DEC_____321816758474
and a
symbolic name of
red
. In this example, the
rr_weight
attributes is set to
priorities
.
multipaths {
multipath {
wwid 3600508b4000156d70001200000b0000
alias yellow
path_grouping_policy multibus
path_checker readsector0
path_selector "round-robin 0"
failback manual
rr_weight priorities
no_path_retry 5
}
multipath {
wwid 1DEC_____321816758474
alias red
rr_weight priorities
}
}
4.5. Configuration File Devices
Table 4.3, “Device Attributes”
shows the attributes that you can set for each individual storage device
in 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