Managing HP Serviceguard A.11.20.20 for Linux, May 2013

• Only IPv4 networks support iSCSI storage devices.
• HP recommends that you do not use heartbeat LAN for iSCSI storage device.
The following restrictions are applicable when iSCSI LUNs are used as a shared storage:
• An iSCSI storage device does not support configuring a lock LUN.
• Hardware initiator models does not support iSCSI storage.
• An iSCSI storage device that are exposed using SCSI targets is not supported.
2.3.2 Disk Monitoring
You can configure monitoring for disks and configure packages to be dependent on the monitor.
For each package, you define a package service that monitors the disks that are activated by that
package. If a disk failure occurs on one node, the monitor will cause the package to fail, with the
potential to fail over to a different node on which the same disks are available.
2.3.3 Sample Disk Configurations
Figure 5 shows a two node cluster. Each node has one root disk which is mirrored and one package
for which it is the primary node. Resources have been allocated to each node so that each node
can adopt the package from the other node. Each package has one disk volume group assigned
to it and the logical volumes in that volume group are mirrored.
Figure 5 Mirrored Disks Connected for High Availability
2.4 Redundant Power Supplies
You can extend the availability of your hardware by providing battery backup to your nodes and
disks. HP-supported uninterruptible power supplies (UPS) can provide this protection from momentary
power loss.
Disks should be attached to power circuits in such a way that disk array copies are attached to
different power sources. The boot disk should be powered from the same circuit as its corresponding
node. Quorum server systems should be powered separately from cluster nodes. Your HP
30 Understanding Hardware Configurations for Serviceguard for Linux