Q

Replacing hardware server

We are going to replace our current hardware server of our SAP R/3 to a new server. Both the current and the new server are SUN machines with Solaris 8. How do I go about this? Shall I take a complete ufsdump of All the filesystems (including / , /usr .. etc) of the current SAP server And then ufsrestore on the new server. OR... Shall I install SAP R/3 on the new server and restore the last full Offline SAP database backup using brrestore?...

Please reply and help me with this migration.


You should back up four areas and restore them to the new hardware:

1. /usr/sap/SID
2. /sapmnt/SID
3. sidadm home directory
4. /oracle/SID

Once you get on the new hardware, you will have to edit the profiles to point to the correct hardware (name). Also don?t forget to apply for the new license ahead of time.

This question though, has other concerns, namely DOWNTIME for cutover. Some options to reduce downtime here are:

1) Use CPIO with multiple streams to copy the data from the old hardware to the new hardware. This assumes that you have sufficiently fast networking (i.e. Gigabit). This would be faster than a backup.
2) Set up a standby database on the new hardware via:
a) Backup and restore -OR- CPIO copy
b) Start applying logs from old hardware to new hardware
c) When both are in sync, cut over at the next downtime window.


This was first published in February 2002

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