Installation guide

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 m ultipathd process. A value of m ax 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_m in_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. T he default value is
uniform.
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).
flush_on_last_del (RHEL 4.7 and later) If set to yes, the m ultipathd 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 m pathn. 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
m ultipaths 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. T he 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. T he 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. T he default value is
determined by the process.
Chapter 4. The DM-Multipath Configuration File
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