Users Guide

6–Boot from SAN Configuration
iSCSI Boot from SAN
104 AH0054602-00 M
Linux Multipath Considerations
iSCSI boot from SAN installations on Linux operating systems are currently
supported only in a single-path configuration. To enable multipath configurations,
perform the installation in a single path, using either an L2 or L4 path. After the
server boots into the installed operating system, perform the required
configurations for enabling multipath I/O (MPIO).
See the appropriate procedure in this section to migrate from L2 to L4 and
configure MPIO for your OS:
 Migrating and Configuring MPIO to Offloaded Interface for RHEL 6.9/6.10
 Migrating and Configuring MPIO to Offloaded Interface for SLES 11 SP4
 Migrating and Configuring MPIO to Offloaded Interface for
SLES 12 SP1/SP2
Migrating and Configuring MPIO to Offloaded Interface for RHEL 6.9/6.10
To migrate from L2 to L4 and configure MPIO to boot the OS over an
offloaded interface for RHEL 6.9/6.10:
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:
ip=ibft
linux dd
3. Provide the DUD and complete the installation.
4. Boot to the OS with L2.
5. Update Open-iSCSI tools and iscsiuio by issuing the following commands:
# rpm -ivh qlgc-open-iscsi-2.0_873.111.rhel6u9-3.x86_64.rpm --force
# rpm -ivh iscsiuio-2.11.5.5-6.rhel6u9.x86_64.rpm --force
6. Edit the /boot/efi/EFI/redhat/grub.conf file, make the following
changes, and then save the file:
a. Remove
ifname=eth5:14:02:ec:ce:dc:6d.
b. Remove
ip=ibft.
c. Add
selinux=0.
7. Build the
initramfs file by issuing the following command:
# dracut –f