HP 3000 Manuals

SPU Switchover/XL User's Guide

Scheduled Switchovers 

The following procedure assumes that an operator wants to perform a
scheduled temporary switchover from the home system for maintenance or
configuration purposes.  This procedure enables a system operator to
switch control of switchable volume sets from a home system (Alpha) to an
alternate system (Beta).

   1.  If necessary, log off existing jobs and sessions on the alternate
       system (Beta) so that it can accept the additional processing load
       from the home system (Alpha).

   2.  Enter the VSCLOSE command for each volume set on the home system
       (Alpha):

            : VSCLOSE volsetname Return 

   3.  Enter the following command from the alternate system (Beta)
       console:

            : SWITCHOVER FROM=ALPHA TO=BETA Return 

       Alpha responds by displaying the following message:

            /00:00/nn/SPU SWITCHOVER FROM ALPHA TO BETA STARTING.

       After this message appears, the alternate system (Beta) does the
       following:

          a.  Unlocks the currently locked switchable volume sets on the
              home system (Alpha).

          b.  Locks and opens the volume sets on the alternate system
              (Beta).

          c.  Displays a message on the alternate system (Beta) for each
              switchable volume set as it is switched over and mounted.

       After the above process occurs, the following message appears once
       on the home system (Alpha) console:

            /00:00/nn/SPU SWITCHOVER FROM ALPHA TO BETA COMPLETE.

       and there is a repeating message on the alternate system (Beta)
       indicating that switchover is complete.

   4.  Enter the SPUCONTROL STATUS command to verify the expected status
       of the SPU Switchover/XL environment.

            : SPUCONTROL STATUS Return 

The following screen is displayed on the console:
___________________________________________________
|                                                 |
|     System   Volume Sets             Home System|
|     ------   -----------             -----------|
|     Beta     b_test_software_set     Beta       |
|              b_benchmark_set         Beta       |
|              a_production_data_set   Alpha      |
|              a_user_vol_set          Alpha      |
|              a_mirror_disk_set       Alpha      |
___________________________________________________

          Figure 3-2.  Example SPUCONTROL STATUS Command Display 

   5.  Restart applications and terminal sessions on the alternate system
       (Beta) that previously ran on the home system (Alpha).  Refer to
       Chapter 5  for information on performing terminal switchovers.

   6.  Inform users that they can log on to Beta.

MPE/iX 5.0 Documentation