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05743 - Disaster Recovery only using backup tapes for an AS/400 SAP system

05743 - Disaster Recovery only using backup tapes for an AS/400 SAP system

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Disaster Recovery only using backup tapes for an AS/400 SAP system

Hi

Some of the group have asked me about how a company recovers their
SAP system from just backup tapes. So I want to start a thread on
disaster recovery. i.e. what do you do when all you have left is a
SAVR3SYS backup (or just the libraries and IFS directories on tape)
and a virgin AS/400 with no SAP installed and no SAP install disks.
It is probably fairly easy to get 4.6c install disks quickly but many
sites are are at earlier releases and may not be able to wait for 3.x
or early 4.x install CD's. If they are available then one could do a
scratch install and then a database copy.

So lets assume that we have an as/400 with no trace of SAP and a full
SAVR3SYS backup (or equivalent)including

/usr/sap/<sid> IFS files
R3<sid>data lib
Kernel lib
R3<sid>400 lib
R3WRK<instance number>
R3QTEMP lib
R3SYS lib
R3400 lib ( only holds SAPOSCOL objects)

We can create the JRN lib and ignore the SQL package libraries. We
can set up the TMS later.

My thought would be that you would have to load these libraries and
directories. Then CFGTCP to set up the TCP-IP configuration to the
SAP standard, probably make the machine look like the (now deceased)
original box. Volker and Jim Doll have given some information about
what is required to set the TCP-IP services.

And then run

CRTR3USR user(*INST) sid(xxx) instance(nn)

where xxx is your <sid> and nn is your instance number

and then run

CRTR3INST sid(xxx)

to create the system objects.

Has anyone had to go through this exercise in real life ?
Given some of the stuff happening in the world right now it does no
harm to have a "worst case plan" on file somewhere.


Matt Milne
Freelance SAP AS/400 BASIS consultant



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