I am back in office today, woke up earlier than usual on a Sunday's morning, reached office at about 9:30am. My two other colleagues were already there.
The plan was to do a OS upgrade for one of our Unix servers, we thought it should not be so complicated, but then, it took us more than eight hours, till now haven't finish. Earlier on, during the installation of the new OS, we found that one of the system mount points was not setup with enough disk size, again had to re-install everything.
The bulk of the time was used to do restoration of data files from the backup cartridage tapes, because the backup server and the server those OS was to be upgraded were in two different VLAN separated by firewalls and hardware loadbalancers, it exceeded our expected time. We are behind the scheduled time now...
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