2.2. Upgrading Virtuozzo 6 with Virtuozzo Storage¶

2.2.1. Upgrading with Spare Virtuozzo 6 Servers¶

1. Update all servers in the cluster based on Virtuozzo 6 to the latest version. You can do this by running yum update on each server.

   Note

   The oldest Virtuozzo 6 build eligible for upgrade is 6.0.11-3466.

2. Choose a server to upgrade in the cluster and migrate VMs and containers from it to other Virtuozzo 6 servers in the cluster.

3. Remove chunk servers from the server:

   1. Find out which chunk servers are stored on the server by running pstorage -c <cluster_name> top on any cluster server.
   2. Initiate removal of chunk servers from the server by running pstorage -c <cluster_name> rm-cs --wait <CS_ID> for each chunk server on the server.

4. Wait until the required chunk servers are removed and Virtuozzo Storage rebuilds. To monitor this process, run pstorage -c <cluster_name> top on any cluster server. The status of the chunk servers being removed will become releasing and the number of replicas on them will start dwindling. When the number of replicas on a CS reaches zero, the CS will be removed both from the server and the pstorage top output. Make sure that no chunk servers are left on the server to be upgraded.

5. Perform a fresh install of Virtuozzo 7 on the server. During installation, choose to create a new Virtuozzo Storage cluster. For instructions, see the Virtuozzo 7 Installation Guide.

6. Choose another Virtuozzo 6 server in the old cluster and migrate VMs and containers from it to the new Virtuozzo Storage cluster based on Virtuozzo 7. For details, see Migrating VMs and Containers from Virtuozzo 6 to Virtuozzo 7.

7. Perform a fresh install of Virtuozzo 7 on the second server. During installation, choose to join the new Virtuozzo Storage cluster based on Virtuozzo 7. For instructions, see the Virtuozzo 7 Installation Guide.

8. Repeat steps 7 and 8 for the remaining servers in the old cluster until all Virtuozzo 6 servers are upgraded to Virtuozzo 7.

9. If you store VM and container backups on a Virtuozzo 6 server, move them to a Virtuozzo 7 server as described in Restoring Virtuozzo 6 Backups to Virtuozzo 7 Servers.

2.2.2. Upgrading by Migrating to a New Virtuozzo Storage Cluster¶

To upgrade by migrating VMs and containers from an old Virtuozzo Storage cluster based on Virtuozzo 6 to a new Virtuozzo Storage cluster based on Virtuozzo 7, do the following:

1. Update all servers in the cluster based on Virtuozzo 6 to the latest version. You can do this by running yum update on each server.

   Note

   The oldest Virtuozzo 6 build eligible for upgrade is 6.0.11-3466.

2. On a different set of servers, create a new Virtuozzo Storage cluster based on Virtuozzo 7. For instructions, see the Virtuozzo 7 Installation Guide.

3. Migrate VMs and containers from the old cluster to the new cluster. For more details, see Migrating VMs and Containers from Virtuozzo 6 to Virtuozzo 7.

4. If you store VM and container backups on a Virtuozzo 6 server, move them to a Virtuozzo 7 server as described in Restoring Virtuozzo 6 Backups to Virtuozzo 7 Servers.

2.2.3. Upgrading In-Place with Virtuozzo Storage¶

Virtuozzo 6 hardware nodes in a Virtuozzo Storage cluster can be upgraded in-place to Virtuozzo 7 as described in Upgrading In-Place with Local Storage.

The following additional requirements must be met:

1. Each node in the cluster must be updated to the latest version of Virtuozzo 6. You can check versions on all cluster nodes with pstorage -c <cluster_name> stat.

   Note

   The oldest Virtuozzo 6 build eligible for upgrade is 6.0.11-3466.

2. Only one cluster node must be upgraded to Virtuozzo 7 at any time.

If at some point your cluster happens to be populated with both Virtuozzo 6 and Virtuozzo 7 hardware nodes, it will retain the functionality of Storage for Virtuozzo 6 but not gain the new features of Storage for Virtuozzo 7 like erasure coding. As soon as all of the hardware nodes in such a hybrid cluster are upgraded to Virtuozzo 7, the cluster will begin operating with complete functionality offered by Storage for Virtuozzo 7.