75 ways to demystify DB2 #75: Techtip : How to recover from a DB2 bug which removes the installed files?
db2segv 310000H77R Visits (6795)
Installfixpack takes a backup of the existing installation files and then starts the installation of the new binaries, if there is a major error failure at some point during the installation of the new binaries, the deployed new binaries are rolled backed and the backup of the old files is restored. In this particular case were db2chgpath is failing inside installfixpack the rollback of the deployed new files happens but the restore of the backup is not happening therefore the files go missing. This problem is addressed via below APARs.
DB2 V10.1 : APAR IT02887 : First Fixed in DB2 V10.1FP5
Now, how do we recover from this mess?