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Epic EHR System Protection, introduced in Veeam Backup & Replication 13.1, can restore an InterSystems IRIS instance either from a backup or from a storage snapshot. When Restoring from Backup, data is copied from the backup repository to the target ODB (operational database) server, and is not affected by the issue described in this article. A restore from a storage snapshot behaves differently. Veeam Backup & Replication creates a thin clone of each selected snapshot on the source storage system through the Universal Storage API and mounts the clones directly to the target ODB server. No data is retrieved from a backup repository. Because a restore point can span multiple original production volumes (for example, when LVM striping is used), a restore typically creates and mounts more than one clone, from one or more storage systems. Access to the mounts requires a host record for the target ODB server on each storage system involved (an initiator group, host group, or storage group, depending on the storage system). If a host record is not created in advance, Veeam Backup & Replication creates one automatically under a reserved name. Neither the clones nor the host records are removed when the restore finishes. For a restore to the original location, the documented pre-restore steps include unmounting the original production disks and removing their LUN masking, after which the clones are the only copies of the instance data. If the storage system is later removed from the Veeam Backup & Replication infrastructure (for example, when the Veeam Backup Server is moved to a new host and the old host is cleaned up, when the backup infrastructure is reorganized, or when the storage system is decommissioned), the objects that Veeam Backup & Replication created for the restore are removed with it. Veeam Backup & Replication identifies its own objects by name prefix, for example VeeamAUX-, VeeamCL_, VEEAM-StorageLUNClone-, or _vih.. When those are deleted, the restored instance either loses access to its data or the data is deleted outright, depending on the storage system. The InterSystems IRIS restore points based on that storage system's snapshots also become unavailable for restore. Note: When a storage system is removed, a confirmation prompt is displayed. However, the prompt does not preserve the restored data.
Permanent Data Loss on Some Storage Systems On some storage systems, removing the storage system from Veeam Backup & Replication triggers a cleanup operation that may permanently impact restored data, with no way to recover it afterward. If a restore from snapshot for Epic EHR System Protection has been performed, review the guidance below for the storage system in use and complete the advised actions before removing the storage system from Veeam Backup & Replication.
Veeam Backup & Replication User Guide > Epic EHR System Protection > Data Restore Veeam Backup & Replication User Guide > Epic EHR System Protection > Managing Application Backups > Restoring from Storage Snapshot Veeam Backup & Replication User Guide > Storage System Snapshot Integration > Configuring Storage Systems > Removing Storage Systems
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