Enabling And Starting Multipath I/O Services - Novell LINUX ENTERPRISE SERVER 11 - STORAGE ADMINISTRATION GUIDE 2-23-2010 Administration Manual

defaults {
dev_loss_tmo 90
fast_io_fail_tmo 5
}
The dev_loss_tmo parameter sets the number of seconds to wait before marking a multipath link as
bad. When the path fails, any current I/O on that failed path fails. The default value varies according
to the device driver being used. The valid range of values is 0 to 600 seconds. To use the driver's
internal timeouts, set the value to zero (0) or to any value greater than 600.
The fast_io_fail_tmo parameter sets the length of time to wait before failing I/O when a link
problem is detected. I/O that reaches the driver fails. If I/O is in a blocked queue, the I/O does not
fail until the dev_loss_tmo time elapses and the queue is unblocked.
Applying Changes Made to the /etc/multipath.conf File
Changes to the
you make changes, save and close the file, then do the following to apply the changes:
1 Stop the
2 Clear old multipath bindings by entering
/sbin/multipath -F
3 Create new multipath bindings by entering
/sbin/multipath -v2 -l
4 Start the
5 Run
mkinitrd
take effect.

7.5 Enabling and Starting Multipath I/O Services

To start multipath services and enable them to start at reboot:
1 Open a terminal console, then log in as the
2 At the terminal console prompt, enter
chkconfig multipathd on
chkconfig boot.multipath on
If the boot.multipath service does not start automatically on system boot, do the following:
1 Open a terminal console, then log in as the
2 Enter
/etc/init.d/boot.multipath start
/etc/init.d/multipathd start
60 SLES 11: Storage Administration Guide
/etc/multipath.conf
service.
multipathd
service.
multipathd
to re-create the INITRD on your system, then reboot in order for the changes to
file cannot take effect when
user or equivalent.
root
user or equivalent.
root
is running. After
multipathd