InfoScale™ 9.0 Storage Foundation and High Availability Configuration and Upgrade Guide - Linux

To manually set up I/O fencing in a non-SCSI-3 PR compliant setup

1. Configure I/O fencing either in majority-based fencing mode with no coordination points or in server-based fencing mode only with CP servers as coordination points.

   See Setting up server-based I/O fencing manually.

   See Setting up majority-based I/O fencing manually .

2. Make sure that the SFHA cluster is online and check that the fencing mode is customized mode or majority mode.

   # vxfenadm -d

3. Make sure that the cluster attribute UseFence is set to SCSI-3.

   # haclus -value UseFence

4. On each node, edit the /etc/vxenviron file as follows:

   	data_disk_fencing=off

5. On each node, edit the /etc/sysconfig/vxfen file as follows:

   	vxfen_vxfnd_tmt=25

6. On each node, edit the /etc/vxfenmode file as follows:

   	loser_exit_delay=55
   	vxfen_script_timeout=25

   Refer to the sample /etc/vxfenmode file.

7. On each node, set the value of the LLT sendhbcap timer parameter value as follows:

   • Run the following command:

     lltconfig -T sendhbcap:3000

   • Add the following line to the /etc/llttab file so that the changes remain persistent after any reboot:

     set-timer senhbcap:3000

8. On any one node, edit the VCS configuration file as follows:

   • Make the VCS configuration file writable:

     	# haconf -makerw

   • For each resource of the type DiskGroup, set the value of the MonitorReservation attribute to 0 and the value of the Reservation attribute to NONE.

     	# hares -modify <dg_resource> MonitorReservation 0

     	# hares -modify <dg_resource> Reservation "NONE"

   • Run the following command to verify the value:

     	# hares -list Type=DiskGroup MonitorReservation!=0

      # hares -list Type=DiskGroup Reservation!="NONE"

     The command should not list any resources.

   • Modify the default value of the Reservation attribute at type-level.

      # haattr -default DiskGroup Reservation "NONE"

   • Make the VCS configuration file read-only

     	# haconf -dump -makero

9. Make sure that the UseFence attribute in the VCS configuration file main.cf is set to SCSI-3.

10. To make these VxFEN changes take effect, stop and restart VxFEN and the dependent modules

    • On each node, run the following command to stop VCS:

      For systemd environments with supported Linux distributions:

      # systemctl stop vcs

      For other supported Linux distributions:

      # /etc/init.d/vcs stop

    • After VCS takes all services offline, run the following command to stop VxFEN:

      For systemd environments with supported Linux distributions:

      # systemctl stop vxfen

      For other supported Linux distributions:

      # /etc/init.d/vxfen stop

    • On each node, run the following commands to restart VxFEN and VCS:

      For systemd environments with supported Linux distributions:

      # systemctl start vxfen

      # systemctl start vcs

      For other supported Linux distributions:

      # /etc/init.d/vxfen start

      # /etc/init.d/vcs start