This topic describes how to check the current state of the cluster
and stop the metadata server that you are upgrading.
You can also prevent the metadata server from restarting automatically
when it is down by issuing the
stopautorestart command as described
in
stopautorestart.
To maximize the availability of the SAN File System cluster in
the event of a power outage, ensure that the following conditions are met
before you prepare the metadata server for upgrade:
- A correctly installed SAN File System configuration requires that each
power supply within a SAN File System engine be powered by separate and independent
power circuits. When the engines are connected in this manner, there can be
no single point of failure in the configuration.
- Of the two power supplies in each engine, at least one of
these should be powered through an uninterruptible power supply (UPS).
- If you do not use a UPS, then use the RSA II's external power supply and
connect it to a UPS as described below.
The external power supply for the RSA II adapter provides access
to the RSA II event log if power to the metadata server engine (in which the
RSA II adapter is installed) is not available. Perform the following steps
to connect the power-supply power cord to your server:
- Connect the power-supply cable to the external power-supply connector
on the RSA II.
- Connect one end of the power cord to the connector on the power-supply
adapter.
- Connect the other end of the power cord to an uninterruptible power supply.
- Verify that the RSA II power LED is lit, which means that there is power
to the RSA II