This section explains the procedures for performing planned system switchover.
To perform a planned system switchover:
When performing a planned system switchover to the alternate BES unit, the alternate portion must be in waiting status. When switching the system back to the normal BES unit, the normal BES unit must be in waiting status. The procedure for performing a planned system switchover is explained below:
When you use the above procedure to perform a planned system switchover, the alternate BES unit performs normal BES unit processing. The normal BES unit becomes inactive. To switch the system back to the normal BES unit, use the following procedure to perform a planned system switchover again:
For a planned system switchover, execute HA monitor's monswap command.
When this command executes, the back-end server at the switching-source unit is placed automatically on standby status.
If you are using Hitachi HA Toolkit Extension, enter the cluster software's planned system switchover command instead of the monswap command.
Table 25-48 shows the planned system switchover operation when you use the standby-less system switchover (effects distributed) facility.
Table 25-48 Planned system switchover operation when the standby-less system switchover (effects distributed) facility is used
Back-end server type | Operation | Move destination |
---|---|---|
Host BES | Moves to the switching destination with the highest priority; if there is no free space in the guest area, moves to the switching destination with the next highest priority. | Guest BES |
Guest BES | Host BES |
Figure 25-74 shows an example of planned system switchover for a host BES. In this example, a server machine (hostA) must be stopped for hardware maintenance of the host.
Figure 25-74 Example of planned system switchover for a host BES
In this example, planned system switchover is executed for the current BES on unt1. The procedure is as follows:
If you are using Hitachi HA Toolkit Extension, enter the cluster software's planned system switchover command.
Figure 25-75 shows an example of planned system switchover for guest BESs (system reactivation). In this example, a unit recovers from an error.
Figure 25-75 Example of planned system switchover for guest BESs (system reactivation)
In this example, BES5 and BES6, which had moved from unt3, are reactivated through planned system switchover. The procedure is as follows:
If you are using Hitachi HA Toolkit Extension, enter the cluster software's planned system switchover command.