Users Guide

6–Boot from SAN Configuration
iSCSI Boot from SAN
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3. Set MPIO services to remain persistent on re-boot as follows:
# chkconfig multipathd on
# chkconfig boot.multipath on
# chkconfig boot.udev on
4. Start multipath services as follows:
# /etc/init.d/boot.multipath start
# /etc/init.d/multipathd start
5. Run multipath –v2 –d to display multipath configuration with a dry run.
6. Locate the
multipath.conf file under /etc/multipath.conf.
7. Edit the
multipath.conf to enable the default section.
8. Rebuild initrd image to include MPIO support:
# mkinitrd –f multipath
9. Reboot the server and boot the OS with multipath support.
Migrating and Configuring MPIO to Offloaded Interface for SLES 12 SP1/SP2
To migrate from L2 to L4 and configure MPIO to boot the OS over an
offloaded interface for SLES 12 SP1/SP2:
1. Configure the iSCSI boot settings for L2 BFS on both ports of the adapter.
The boot will log in through only one port, but will create an iSCSI Boot
Firmware Table (iBFT) interface for both ports.
2. While booting to the CD, ensure that you specify the following kernel
parameters:
dud=1
rd.iscsi.ibft
3. Provide the DUD and complete the installation.
NOTE
\
If the file is not present, copy multipath.conf from the
/usr/share/doc/packages/multipath-tools folder:
cp /usr/share/doc/packages/multipath-tools/multipath.
conf.defaults /etc/multipath.conf
NOTE
\
For any additional changes in the /etc/multipath.conf file to take effect,
you must rebuild the initrd image and reboot the server.