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descriptive error is not passed through to the client. Check the syslog for a full description

of the possible errors if the uninstall is unsuccessful.

2.6. Restoring CFS

Should a CFS server ever fail or need to be repurposed, all persisted data can be restored or moved

onto a new CFS server by configuring the server as you would a new server but then replacing the

CNS rootUUID with the previously configured one. Recovering with the rootUUID will not restore

files that had not yet been spooled into DX Storage or that were written to the namespace in the 60

seconds prior to a server failure. For planned moves, administrators should ensure that writes are

quiesced for a period of time prior to the restore.

To re-install or move CFS onto a new server, execute the following steps:

If migrating from version 2.0, install Red Hat 6.0 on a new server.

Install and configure CNS as it was configured previously using the installation instructions

above. The DX Storage cluster MUST be the same as the previous configuration in order to

retrieve the previously stored data.

Stop all client activity on the old server. Stopping remote Samba or NFS access to the share is

an easy way to do this.

Monitor the local spooler cache draining to zero by using the following script:

./cfs-checkspool

The script will monitor the spool cache and any active writes for all configured shares in a loop

and print a statement when all activity has completed and it is safe to shutdown CFS.

Stop CFS on the old server: /etc/init.d/caringo-cfs stop

Stop CNS on the old server: /etc/init.d/caringo-cns stop

Edit the CNS configuration file on the new server (nano /opt/caringo/fabric/etc/

cns.conf) and replace the existing root_anchor parameter with the previous server's

rootUUID.

Recreate the CFS shares using the cfs-admin mkfs script. The DX Storage cluster and the

mount IDs for the shares MUST be same as the ones prior to the upgrade.

Start CNS and CFS as normal.

If you are restoring a system after a failure, the process is the same except steps 2-5 above will not

be necessary.

Version 2.6

February 2011