Novell LINUX ENTERPRISE SERVER 11 - STORAGE ADMINISTRATION GUIDE 2-23-2010, Руководство администратора, Страница: 60 / 140

60 SLES 11: Storage Administration Guide
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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
/etc/multipath.conf
file cannot take effect when
multipathd
is running. After
you make changes, save and close the file, then do the following to apply the changes:
1 Stop the
multipathd
service.
2 Clear old multipath bindings by entering
/sbin/multipath -F
3 Create new multipath bindings by entering
/sbin/multipath -v2 -l
4
Start the
multipathd
service.
5 Run
mkinitrd
to re-create the INITRD on your system, then reboot in order for the changes to
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
root
user or equivalent.
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
root
user or equivalent.
2 Enter
/etc/init.d/boot.multipath start
/etc/init.d/multipathd start