IBM TotalStorage DS300 Best Practices Manual page 443

danube:~ #
Before using the multipath-tools it is advantageous to create the configuration file
/etc/multipath.conf. There is an example configuration file located in
/usr/share/doc/packages/multipath-tools/multipath.conf.annotated for reference.
As we are using ConnFailTimeout=10 in /etc/iscsi.conf we configure
queue_if_no_path in /etc/multipath.conf as shown in Example 7-10. With this
configuration, DM MPIO queues all IO in case of errors leading loss of all paths,
and never propagates errors upwards.
We also added sda to the devnode_blacklist as this internal drive (sda) in the
server should not be scanned for DM MPIO.
Example 7-10 /etc/multipath.conf
defaults {
default_features "1 queue_if_no_path"
}
#
# name : devnode_blacklist
# scope : multipath & multipathd
# desc : list of device names to discard as not multipath candidates
# default : cciss, fd, hd, md, dm, sr, scd, st, ram, raw, loop
#
devnode_blacklist {
devnode cciss
devnode fd
devnode hd
devnode md
devnode dm
devnode sr
devnode scd
devnode st
devnode ram
devnode raw
devnode loop
devnode sda
}
It is now necessary to create device targets for the multipath device. This is done
by executing the following command:
/etc/init.d/boot.multipath start
Now the multipath daemon can be started:
/etc/init.d/multipathd start
Chapter 7. TotalStorage DS300 installation
425