Avago Technologies Syncro 9361-8i - Manual (Page 50)

Avago Technologies
- 50 -
Syncro CS 9361-8i and Syncro CS 9380-8e Solution User Guide 
October 2014
Chapter 2: Creating the Cluster
Creating the Cluster in SuSE Linux Enterprise Server (SLES)
2.4.4.3 Configure stonith_sbd Fencing
Stonith_sbd is the fencing mechanism used in SLES-HA. Fencing ensures data integrity on the shared storage by not
allowing problematic nodes from accessing the cluster resources. Before you create another resource, you have to
configure this mechanism correctly.
For this example, the World Wide Name (WWN - 0x600605b00316386019265c4910e9a343) refers to /dev/sda1.
NOTE Use only the wwn-xyz device handle to configure stonith_sbd. Note
that the /dev/sda1 device handle is not persistent, and using it can
cause sbd unavailability after a reboot.
Perform the following step to set up the stonith_sbd fencing mechanism.
1. Create the sbd header and set the watchdog timeout to 52 seconds and mgswait timeout to 104 seconds by
entering the following at the command prompt:
sles-ha1:~ # sbd -d
/dev/disk/by-id/wwn-0x600605b00316386019265c4910e9a343-part1 -4 104 -1 52
create
The following output appears.
Initializing device
/dev/disk/by-id/wwn-0x600605b00316386019265c4910e9a343-part1
Creating version 2 header on device 3
Initializing 255 slots on device 3
Device /dev/disk/by-id/wwn-0x600605b00316386019265c4910e9a343-part1 is
initialized.
2. Verify that the sbd header was created and timeout set properly by entering the following at the command
prompt:
sles-ha1:~ # sbd -d /dev/disk/by-id/wwn-0x600605b00316386019265c4910e9a343-part1 dump
The following output appears.
==Dumping header on disk
/dev/disk/by-id/wwn-0x600605b00316386019265c4910e9a343-part1
Header version : 2
Number of slots : 255
Sector size : 512
Timeout (watchdog) : 10
Timeout (allocate) : 2
Timeout (loop) : 1
Timeout (msgwait) : 104
==Header on disk /dev/disk/by-id/wwn-0x600605b00316386019265c4910e9a343-part1
is dumped
3. Add the contents to /etc/sysconfig/sbd by entering the following at the command prompt:
sles-ha1:~ # cat /etc/sysconfig/sbd
The following output appears.
SBD_DEVICE="/dev/disk/by-id/wwn-0x600605b00316386019265c4910e9a343-part1"
SBD_OPTS="-W"
4. Allocate a slot for the node 1 for sbd by entering the following at the command prompt:
sles-ha1: # scp /etc/sysconfig/sbd root@sles-ha2:/etc/sysconfig/