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Snapshotting a Logical Volume

Snapshots in simplyblock provide point-in-time copies of logical Volumes (LVs), allowing for backup, recovery, or cloning operations without impacting the active workload. Snapshots can be created using the sbctl command line interface to protect critical data or enable development and testing environments based on production data.

What a Snapshot Is in simplyblock

Snapshots are point-in-time recovery artifacts for an existing logical volume. In operational workflows, snapshots are commonly used for:

  • short-term protection before risky changes,
  • rollback points during maintenance,
  • rapid creation of clone-based test or staging datasets.

Prerequisites

Before creating snapshots:

  • A running simplyblock cluster with an existing logical volume.
  • sbctl installed and configured with access to the simplyblock management API.
  • Sufficient free capacity for expected post-snapshot data changes.
  • Application-level consistency steps defined (for example, quiesce or flush behavior) when required by workload.

Snapshot Naming Guidance

Use a consistent naming convention to simplify operations and retention management.

Example naming patterns:

  • before-upgrade-2026-04-13
  • prod-db-pre-maintenance-<timestamp>
  • daily-backup-<timestamp>

Creating a Snapshot

To create a snapshot of an existing Logical Volume:

Create a snapshot
sbctl snapshot add \
  <VOLUME_UUID> \
  <SNAPSHOT_NAME>

Listing and Inspecting Snapshots

After creation, list snapshots to confirm the new entry and review metadata:

List snapshots
sbctl snapshot list

Restore and Clone Workflows

After a snapshot is created, common next operations include:

  • reverting a logical volume to a snapshot,
  • creating a clone from a snapshot for testing or recovery validation.

For clone-based workflows, see Cloning.

Verification

After snapshot creation:

  • Confirm the snapshot appears in the list output.
  • Confirm it is associated with the expected source logical volume.
  • For critical workloads, validate restore or clone behavior in a non-production path before relying on the snapshot.

Retention and Cleanup

To avoid uncontrolled growth of snapshot footprint:

  • Define snapshot retention windows by workload criticality.
  • Remove obsolete snapshots as part of regular maintenance.
  • Increase cleanup frequency for high-churn workloads.

Troubleshooting

Common snapshot issues include:

  • Snapshot not listed after creation: verify command target volume and CLI/API connectivity.
  • Snapshot exists but application recovery is inconsistent: review workload quiesce/flush procedure.
  • Unexpected capacity pressure: review retention policy and remove stale snapshots.