Managing HP Serviceguard A.11.20.20 for Linux, March 2014

multipath failover mode on Linux systems application note”, which you can find by entering the
terms qlogic multipath application into the search box of www.hp.com.
NOTE: With the rapid evolution of Linux, the multipath mechanisms may change, or new ones
may be added. Serviceguard for Linux supports DeviceMapper multipath (DM-MPIO) with some
restrictions; see the Serviceguard for Linux Certification Matrix at the address provided in the
Preface to this manual for up-to-date information.
NOTE: md also supports software RAID; but this configuration is not currently supported with
Serviceguard for Linux.
4.3.4 Disk I/O Information
You may want to use the Hardware worksheet in Appendix C to record the following information
for each disk connected to each disk device adapter on the node:
Bus Type Indicate the type of bus. Supported buses are SAS (Serial Attached SCSI)
and FibreChannel.
LUN Number Indicate the number of the LUN as defined in the storage unit.
Slot Number Indicate the slot number(s) into which the SCSI or FibreChannel interface
card(s) are inserted in the backplane of the computer.
Address Enter the bus hardware path number, which is the numeric part of the
host parameter, which can be seen on the system by using the following
command:
cat /proc/scsi/scsi
Disk Device File Enter the disk device file name for each SCSI disk or LUN.
This information is needed when you create the mirrored disk configuration using LVM. In addition,
it is useful to gather as much information as possible about your disk configuration.
You can obtain information about available disks by using the following commands; your system
may provide other utilities as well.
• ls /dev/sd* (Smart Array cluster storage)
• ls /dev/hd* (non-SCSI/FibreChannel disks)
• ls /dev/sd* (SCSI and FibreChannel disks)
• du
• df
• mount
• vgdisplay -v
• lvdisplay -v
See the manpages for these commands for information about specific usage. The commands should
be issued from all nodes after installing the hardware and rebooting the system. The information
will be useful when doing LVM and cluster configuration.
4.3.5 Hardware Configuration Worksheet
The hardware configuration worksheet (page 285) will help you organize and record your specific
cluster hardware configuration. Make as many copies as you need.
4.3 Hardware Planning 83