Rational® ClearCase® provides
tools that enable you to configure one or more backup registry hosts.
A backup registry host can take over when a registry server fails.
Access to the registry is critical for nearly all Rational ClearCase operations.
Because registry data is such an important resource, you can designate
any Rational ClearCase host
as a backup registry host and periodically copy registry data to it
with the rgy_backup command. If the primary registry
host fails, you can run the rgy_switchover program,
which promotes the backup registry host to primary registry host and
reconfigures client hosts to use it.
This topic describes two scenarios that involve the failure of
a registry host, one that assumes you have been using rgy_backup and
one that assumes you have not (but have been backing up the primary
registry host's file system, as described in Backing up Rational ClearCase registry data).
The
Rational ClearCase scheduler
service runs the
rgy_backup command periodically
on all hosts. On a
Rational ClearCase host
that is not configured as a backup registry host, the command does
nothing. On a
Rational ClearCase host
that is configured as a backup registry host, the command copies the
primary registry host's registry database and client list to
the backup registry host, where it can be used if the host is promoted
to primary registry host. For more information, see the
rgy_backup reference
page and
The Rational ClearCase scheduler.
Note: To
run the rgy_backup command, you must have write
permission to the backup registry database directory.