Changing Parallels Cloud Storage Cluster Network

Before moving your cluster to a new network, consider the following:

• Changing the cluster network results in a brief downtime for the period when more than half of the MDS servers are unavailable.
• It is highly recommended to back up all MDS repositories before changing the cluster network.

To change the Parallels Cloud Storage cluster network, do the following on each node in the cluster where an MDS service is running:

1. Stop the MDS service:

   # service pstorage-mdsd stop

2. Specify new IP addresses for all metadata servers in the cluster with the command pstorage configure-mds -r <MDS_repo> -n <MDS_ID @ new_IP_address> [:port] [-n ...] , where:
   • <MDS_repo> is the repository path of the MDS on the current node.
   • Each <MDS_ID @ new_IP_address> pair is an MDS identifier and a corresponding new IP address.

   For example, for a cluster with 5 metadata servers:

   # pstorage -c pcs1 configure-mds -r /pstorage/pcs1-cs1/mds/data -n 1@10.10.20.1 -n 2@10.10.20.2 -n 3@10.10.20.3 -n 4@10.10.20.4 -n 5@10.10.20.5

   Notes:
   
   1. You can obtain the identifier and repository path for the current MDS with the pstorage list-services -M command.
   
   2. If you omit the port, the default port 2510 will be used.

3. Start the MDS service:

   # service pstorage-mdsd start