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  1. Home
  3. NetBackup™ Snapshot Manager for Data Center Administrator's Guide
  5. Storage array plug-ins for Snapshot Manager for Data Center
  7. Lenovo DM 5000 series array
  9. Supported Snapshot Manager for Data Center operations on Lenovo DM 5000 models
NetBackup™ Snapshot Manager for Data Center Administrator's Guide

Supported Snapshot Manager for Data Center operations on Lenovo DM 5000 models

NetBackup Snapshot Manager for Data Center performs the following snapshot management operations on the Lenovo DM array:

Note:

In the case of Lenovo DM, a LUN is part of a volume and the action performed on a single LUN is performed on it's entire parent volume internally. Therefore, a volume acts as a consistency group.

Table: NetBackup Snapshot Manager for Data Center operations on the Lenovo DM array

Snapshot Manager for Data Center operations

Description

Discover assets

NetBackup Snapshot Manager for Data Center discovers the volume, LUNs that are created from storage volumes.

  • LUNs that have an online status and read-write operations enabled can be discovered.

  • During the discovery of assets, the plug-in creates a mapping between volumes and LUNs.

  • Only online volumes are discovered

  • NetBackup Snapshot Manager for Data Center discovers all the NAS volumes that are online and using the active junction path on the Lenovo DM storage. Junction-Path specifies the access protocol for either NFS or SMB.

Create snapshot

NetBackup Snapshot Manager for Data Center takes a snapshot of the Lenovo DM volumes and LUNs

  • When a LUN snapshot is triggered on the Lenovo DM storage, it internally triggers a redirect-on-write (ROW) snapshot of the entire volume to which the LUN belongs. If the volume contains multiple LUNs, the snapshot includes data from the LUNs that reside on the associated volume.

  • When a volume snapshot is triggered on the Lenovo DM storage, it creates a redirect-on-write (ROW) snapshot of the entire volume and returns the snapshot data of the volume.

  • Snapshot Manager for Data Center takes a snapshot of the Lenovo DM NFS and SMB share using volume.

  • To create a snapshot, Data Center initiates a POST API call on the volume.

    A typical snapshot created has the following naming convention: NB<unique_21digit_number>

Export snapshot

When a snapshot export operation triggers for a LUN Snapshot Object, NetBackup Snapshot Manager for Data Center creates a LUN clone from the snapshot and attaches it to the target.

When a snapshot export operation triggers for a Volume Snapshot Object, NetBackup Snapshot Manager for Data Center creates a volume clone from the snapshot and attaches all the LUNs associated with the volume to the target.

The target host is assigned with the read-write privileges on the exported entity (Volume/ LUN).

The export operation is supported using the following protocols:

  • Fiber Channel (FC)

  • Internet Small Computer Systems Interface (iSCSI)

When a snapshot export operation is triggered, for NFS, export policy rules are checked for source volume.

If the export rules match the client (selected in the policy) which includes protocols as NFS or SMB or both with superuser access. Then the backup is performed directly on the client.

If no export rule match is found, then a new rule with the NFS protocol, read-only with superuser access, is created in the export policy and assigned to the export snapshot.

For the SMB protocol, a new share is created with read permission, which includes the path of the snapshot. This share name is created with a name, and a snapshot name prefix.

Example: NB<unique_21digit_number>-432464523

Restore snapshot

  • When you restore a LUN from a snapshot, NetBackup Snapshot Manager for Data Center restores the entire volume of the LUN where the restore is triggered.

  • The LUN snapshot is a ROW snapshot of the underlying volume, and that volume can contain multiple LUN. Even if the restore is triggered for a single LUN, the restore is performed on the entire volume. Data on the other LUNs remains unchanged.

  • The volume snapshot restores a snapshot copy to the read-write volume. If the current working copy of the volume is replaced with the snapshot copy. Then it results in the loss of all changes made since the snapshot copy was created.

Note:

If a restore operation is performed on the older snapshots, then all the latest snapshots captured are deleted as a part of Lenovo DM behavior, and the latest snapshot cannot be restored.

Delete snapshot

When the delete snapshot operation is triggered for the following:

  • LUN snapshot - NetBackup Snapshot Manager for Data Center internally deletes the snapshot of one or more volumes to which the LUN is associated.

  • Volume snapshot - NetBackup Snapshot Manager for Data Center deletes the snapshot corresponding to the volume.

  • NetBackup Snapshot Manager for Data Center deletes the snapshot of the NAS volume.

Deport snapshot

When a deport snapshot operation is triggered for the following,

  • LUN Deport - NetBackup Snapshot Manager for Data Center removes the LUN mapping from the target host and then deletes the LUN clone.

  • Volume deport - NetBackup Snapshot Manager for Data Center removes the mapping from the LUN hosts associated with the volume and then deletes the volume clone.

  • When a snapshot deport operation is triggered, for SMB NetBackupSnapshot Manager for Data Center deletes the shares created during the export call. For NFS, no action is performed.

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