4.0.0 HP Polyserve Matrix Server Installation Guide (T5392-96046, March 2010)

and communicate with other servers in the matrix, Matrix Server must remove the
server’s access to filesystems to preserve data integrity. This step is called fencing.
When you configure the matrix later in this procedure, you can select the fencing
method that you want to use:
• FibreChannel Switch-based fencing (also called “fabric fencing”). When a server
needs to be fenced, Matrix Server disables the server’s access in the FibreChannel
fabric.
• Web Management-Based Fencing via Server Reset/Shutdown (also called
“server-based fencing”). Matrix Server uses remote management hardware on
the server to remove its access to PSFS filesystems.
For sites using fabric fencing, the FibreChannel switches must be configured as
described below to enable matrix operations across the SAN.
Configuring the FibreChannel switches is not required for sites using server-based
fencing. However, if the switches are configured as described here, certain Matrix
Server commands can return more information.
To configure FibreChannel switches, complete the following tasks:
• Enable server access to the SAN. Each server that will be in the matrix must be
able to access the disks in the SAN. You may need to enable server ports on the
FC switches or to change the zoning configuration to give servers the necessary
access to the SAN.
• Modify the SNMP setup. Make the following changes:
• Enable access to the SNMP agent from each server that will be in the matrix.
• Set the SNMP community string to the desired value. The community string
must be the same for all FibreChannel switches. If you are using fabric fencing,
ensure that the community string has write privileges. For server-based fencing,
you can optionally configure a read-only community string.
• On Brocade switches only, run the snmpMibCapSet command on the switch.
Change the famib setting to yes and accept the default values for the other
settings.
• For McDATA switches, domain-wide RSCNs should be disabled.
• If the servers are connected to switches in multiple fabrics, the physical ports on
each switch must be assigned to unique domain IDs. A different domain ID must
be used on each fabric (any given domain ID can exist on only one fabric in the
SAN). For example, if a server is connected to two switches that are not in the
same fabric, switch1 could use domain ID 6 and switch2 could use domain ID
7. Domain ID 6 must not exist on the fabric containing switch2 and domain ID
7 must not exist on the fabric containing switch1.
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