The following error after system update
# service postgresql start An old version of the database format was found. You need to upgrade the data format before using PostgreSQL.
H-Sphere works correctly only with Postgres 7.x.
Install Postgresql rpm's that are shipped with H-Sphere:
# cd /hsphere/pkg/ # rpm -Uvh postgresql*.rpm --force
# service postgresql start
Note: The issue may be avoided by yum exclude mechanism (see Force yum update Command To Exclude Certain Packages for details).