Dell EMC Metro node 7.0.1 Administrator Guide

Metadata is stored in cache and backed up on specially designated external volumes called meta-volumes.

Meta-volumes are created during system setup.

When a cluster is initially configured, the meta-volume must be the first storage presented to metro node. This prevents the meta-volume from being accidentally overwritten.

After the meta-volume is configured, updates to the metadata are written to both the cache and the meta-volume when the metro node configuration is modified.

Backup meta-volumes are point-in-time snapshots of the current metadata, and provide extra protection before major configuration changes, refreshes, or migrations.

Metadata is read from the meta-volume only during the start of each director.

Meta-volume backups are created:

• Before migrating to a new array
• Before a major update.

Meta-volumes differ from standard storage volumes as mentioned below:

• A meta-volume is created without first being claimed
• Meta-volumes are created directly on storage volumes.

See the Configuration and Installation Guide for metro node for more details about the criteria to select storage used for meta-volumes.