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To add or remove a slave node from the system requires that the
database czar stops the master node's cdserv process. Then, the
master's hepdb.names file needs to be changed accordingly via
the init.pl script. Specifically, to add a node:
- Have the new slave node's database contact person install the
current version of the database.
- Edit
/$SNODB_VER/scripts/snodb_lib/init.pl on
the master node, adding the new node to the node list.
- Run /$SNODB_VER/scripts/snodb.perl -dir on the
master node to add the new to_node(localq) subdirectory.
- Add the new node to the .netrc file with the appropriate
information.
- Run /$SNODB_VER/scripts/snodb.perl -names on the
master node to create a new version of the hepdb.names
file.
- For the case in which the master node and slave node
platforms are running the same OS (or if another slave node is
running the same OS), one can simply copy the database files.
For different OS's, we had hoped to use
the HEPDB routines HDBTOFZ and
HDBFRFZ. These subroutines convert HEPDB native
format files to and from FZ exchange mode format files.
Regrettably, these documented routines do not exist, so
one must rebuild the database using all the
journal file backups made on the master node, putting
them into the correct localq directory and propagating them
out to the slave node being added.
The next time cdserv is started, it will read this new hepdb.names
file and the new slave node will be treated like the other nodes. If you wish
to make the change take effect immediately, you must stop and start cdserv
via /$SNODB_VER/scripts/snodb.perl -stop_server and
/$SNODB_VER/scripts/snodb.perl -server, respectively.
To remove a node,
- Edit /$SNODB_VER/scripts/snodb_lib/init.pl on
the master node, removing the node from the node list.
- From the command line, delete the to_node subdirectory.
- Run /$SNODB_VER/scripts/snodb.perl -names on the
master node to create a new version of the hepdb.names
file.
If you wish to make the change take effect immediately, follow the instructions
above for stopping and starting cdserv.
Changing the characteristics of a particular node involves an obvious
combination of the two procedures outlined above.
Next: Setting Up the
Up: Database Maintenance
Previous: Database Purging