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Sun Cluster System Administration Guide for Solaris OS

ProcedureHow to Reset the Time of Day in a Cluster

Sun Cluster software uses the Network Time Protocol (NTP) to maintain time synchronization between cluster nodes. Adjustments in the global cluster occur automatically as needed when nodes synchronize their time. For more information, see the Sun Cluster Concepts Guide for Solaris OS and the Network Time Protocol User's Guide.

Caution – Caution –

When using NTP, do not attempt to adjust the cluster time while the cluster is up and running. Do not adjust the time by using the date(1), rdate(1M), xntpd(1M), or svcadm(1M) commands interactively or within cron(1M) scripts.

The phys-schost# prompt reflects a global-cluster prompt. Perform this procedure on a global cluster.

This procedure provides the long forms of the Sun Cluster commands. Most commands also have short forms. Except for the long and short forms of the command names, the commands are identical. For a list of the commands and their short forms, see Appendix B, Sun Cluster Object-Oriented Commands.

  1. Become superuser on any node in the global cluster.

  2. Shut down the global cluster.


    phys-schost# cluster shutdown -g0 -y -i 0

  3. Verify that the node is showing the ok prompt on a SPARC based system or the Press any key to continue message on the GRUB menu on an x86 based system.

  4. Boot the node in noncluster mode.

    • On SPARC based systems, run the following command.


      ok boot -x

    • On x86 based systems, run the following commands.


      # shutdown -g -y -i0

Press any key to continue

    1. In the GRUB menu, use the arrow keys to select the appropriate Solaris entry and type e to edit its commands.

      The GRUB menu appears similar to the following:


      GNU GRUB version 0.95 (631K lower / 2095488K upper memory)
+-------------------------------------------------------------------------+
| Solaris 10 /sol_10_x86                                                  |
| Solaris failsafe                                                        |
|                                                                         |
+-------------------------------------------------------------------------+
Use the ^ and v keys to select which entry is highlighted.
Press enter to boot the selected OS, 'e' to edit the
commands before booting, or 'c' for a command-line.

      For more information about GRUB based booting, see Booting an x86 Based System by Using GRUB (Task Map) in System Administration Guide: Basic Administration.

    2. In the boot parameters screen, use the arrow keys to select the kernel entry and type e to edit the entry.

      The GRUB boot parameters screen appears similar to the following: 


      GNU GRUB version 0.95 (615K lower / 2095552K upper memory)
+----------------------------------------------------------------------+
| root (hd0,0,a)                                                       |
| kernel /platform/i86pc/multiboot                                     |
| module /platform/i86pc/boot_archive                                  |
+----------------------------------------------------------------------+
Use the ^ and v keys to select which entry is highlighted.
Press 'b' to boot, 'e' to edit the selected command in the
boot sequence, 'c' for a command-line, 'o' to open a new line
after ('O' for before) the selected line, 'd' to remove the
selected line, or escape to go back to the main menu.

    3. Add -x to the command to specify system boot into noncluster mode.


      [ Minimal BASH-like line editing is supported. For the first word, TAB
lists possible command completions. Anywhere else TAB lists the possible
completions of a device/filename. ESC at any time exits. ]

grub edit> kernel /platform/i86pc/multiboot -x

    4. Press the Enter key to accept the change and return to the boot parameters screen.

      The screen displays the edited command. 


      GNU GRUB version 0.95 (615K lower / 2095552K upper memory)
+----------------------------------------------------------------------+
| root (hd0,0,a)                                                       |
| kernel /platform/i86pc/multiboot -x                                  |
| module /platform/i86pc/boot_archive                                  |
+----------------------------------------------------------------------+
Use the ^ and v keys to select which entry is highlighted.
Press 'b' to boot, 'e' to edit the selected command in the
boot sequence, 'c' for a command-line, 'o' to open a new line
after ('O' for before) the selected line, 'd' to remove the
selected line, or escape to go back to the main menu.-

    5. Type b to boot the node into noncluster mode.

      Note –

      This change to the kernel boot parameter command does not persist over the system boot. The next time you reboot the node, it will boot into cluster mode. To boot into noncluster mode instead, perform these steps again to add the -x option to the kernel boot parameter command.

  5. On a single node, set the time of day by running the date command.


    phys-schost# date HHMM.SS

  6. On the other machines, synchronize the time to that node by running the rdate(1M) command.


    phys-schost# rdate hostname

  7. Boot each node to restart the cluster.


    phys-schost# reboot

  8. Verify that the change occurred on all cluster nodes.

    On each node, run the date command.


    phys-schost# date