6–Boot from SAN Configuration
iSCSI Boot from SAN
105
BC0154501-00 P
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.
4.
Boot to the OS with L2.
5.
Update the Open-iSCSI tools by issuing the following commands:
#
rpm -ivh qlgc-open-iscsi-2.0_873.111.sles12sp1-3.x86_64.rpm --force
#
rpm -ivh iscsiuio-2.11.5.5-6.sles12sp1.x86_64.rpm --force
6.
Edit the
/etc/default/grub
file by changing the
rd.iscsi.ibft
parameter to
rd.iscsi.firmware
, and then save the file.
7.
Issue the following command:
#
grub2-mkconfig -o /boot/efi/EFI/suse/grub.cfg
8.
To load the multipath module, issue the following command:
#
modprobe dm_multipath
9.
To enable the multipath daemon, issue the following commands:
#
systemctl start multipathd.service
#
systemctl enable multipathd.service
#
systemctl start multipathd.socket
10. To run the multipath utility, issue the following commands:
#
multipath
(may not show the multipath devices because it is booted with a
single path on L2)
#
multipath -ll
11.
To inject the multipath module in initrd, issue the following command:
#
dracut --force --add multipath --include /etc/multipath
12. Reboot the server and enter system settings by pressing the F9 key during
the POST menu.