NonStop S-Series Hardware Installation and FastPath Guide (G06.29+)

Troubleshooting
HP NonStop S-Series Hardware Installation and FastPath Guide541880-002
D-26
Backing Out a Software Revision
Backing Out a Software Revision
If you encounter problems, you can back out from the current software revision to a
previous revision.
For example, if you install an SPR that causes system problems, you can use the
following procedure to return to the previous revision. DSM/SCM makes the current
revision inaccessible, reapplies the previous revision, and displays instructions for
activating the previous revision.
Prerequisites
Skip 7. Stop System and 8. Load System From Saved Configuration if the current
revision did not require SYSGENR or system load.
When backing out a revision, you do not need to fall back to a previous firmware
version if you have not updated the firmware to versions different from that shipped
with your NonStop S-series server.
If you need to back out a revision and DSM/SCM will not run, see the DSM/SCM
User’s Guide.
1. Start DSM/SCM
1. If the TMF subsystem is not already running, start it at a TACL prompt:
> TMFCOM START TMF
2. If DSM/SCM is not already running, start it:
> VOLUME $DSMSCM.ZDSMSCM
> RUN STARTSCM
Task Page
Prerequisites
D-26
1. Start DSM/SCM D-26
2. Start and Log On to Target Interface D-27
3. Initiate Backout Activity D-27
4. Monitor Backout Process D-28
5. Stop All Applications D-28
6. Rename Software Files Using ZPHIRNM D-29
7. Stop System D-29
8. Load System From Saved Configuration D-30
9. Start Applications D-30