As described in sk163300, the output file of the mds_backup was renamed from mdsbk.tgz to mdsbk.tar for compressing the files only once.
Due to this change, the restore that performed via Gaia restore (and not via mds_restore.sh) is failing as still trying to use the mdsbk.tgz
This problem was fixed. The fix is included in:
As a workaround, open $MDSDIR/conf/mds.cpbak and change the below line:
yes | ./mds_restore *.mdsbk.tgz
yes | ./mds_restore *.mdsbk.tar
This solution has been verified for the specific scenario, described by the combination of Product, Version and Symptoms. It may not work in other scenarios.