Set Snapshot

This function creates a snapshot destination SDV for a NAS user volume and sets an acquisition schedule.

This function is displayed in a Unified Storage environment.

Snapshot Acquisition Methods

There are two methods to acquire a snapshot depending on the usage.

• Snapshots for file servers

  The snapshot is set from Web GUI, CLI, or ETERNUS SF Storage Cruiser. Use this function to set the snapshot from Web GUI. In this case, "Automatic" is displayed in the "Mode" field of the [Snapshot] screen.

• Snapshots for virtual machines

  The snapshot is set from VMware vSphere Web Client. Refer to "ETERNUS vCenter Plug-in User's Guide" for details. In this case, "Manual" is displayed in the "Mode" field of the [Snapshot] screen.

Initial Snapshot Setting (*1)

• SDVs are automatically created in proportion to the specified number of generations.

• The logical capacity of SDVs is the same as the NAS user volumes. (*2)

• The base name for SDVs can be specified.

• The RAID group to store SDVs can be selected. (*3)

• If the collection mode is "Automatic", the acquisition schedule (day of the week and time) can be set.

• If the collection mode is "Automatic" and the snapshot setting is successfully completed, a snapshot is automatically acquired.

*1	:	"Initial snapshot setting" is when the snapshot is first configured from a non-configured state, or the first time a configuration is performed after the [Delete Snapshot] function has been executed.
*2	:	SDVs in proportion to the specified number of generations all have the same capacity.
*3	:	SDVs in proportion to the specified number of generations are stored in the selected RAID group.

Snapshot Setting Modification

• The number of generations can be changed.

• When increasing the number of generations, unused SDVs are automatically created.

• If the collection mode is "Automatic", the number of generations can be smaller than the number of snapshot sessions.

  In this case, SDVs are deleted from the unused SDVs first, and then older generation SDVs.

• If the collection mode is "Automatic", the acquisition schedule (day of the week and time) can be changed.

• When the snapshot is "Active", the snapshot start state is continued.

Requirements for RAID Groups that Store the snapshot Destination SDVs

• The RAID group status is not "Broken", "No Drive Path", or "SED Locked"

• The maximum number of volumes or the maximum volume capacity that can be registered in a RAID group has not been reached

  (SDVs are created in proportion to the specified number of generations in the same RAID group in each NAS user volume.)

• RAID groups where volumes are already created or are unused

  (Snapshot destination SDVs for multiple NAS user volumes can be created in the same RAID group.)

• The RAID group must not belong to TPPs

• The RAID group must not belong to FTRPs

• RAID groups that are not registered as REC Disk Buffers

• RAID groups that are not registered as Extreme Cache Pools

Number of Snapshot Generations

The following table shows the maximum number of NAS user volumes and the maximum number of generations for each model.

*1

:

The total number of generations in the storage system (or the total number of generations for the "Automatic" and "Manual" modes). For example, when the ETERNUS DX500 S5 is used and 64 generations of snapshots are created for two NAS user volumes, snapshots cannot be configured for the third NAS user volume.

Availability of Executions in the Default Role

Refer to "User Roles and Policies" for details on the policies and roles.

In this screen, set the snapshot destination SDV for the NAS user volume and the acquisition schedule.

Snapshot Setting

[Schedule Time Settings] Screen

Specify the time to acquire a snapshot.

Schedule Time Settings

Select RAID Group

In this screen, select RAID groups to create the snapshot destination SDVs. SDVs for all the generations are created in the selected RAID group.

The RAID group can be selected only in the initial snapshot setting.

Initial Snapshot Setting

1. Select the NAS user volume to setup snapshot and click [Set Snapshot] in [Action].

2. Input the snapshot information, and click the [Set] button.

   → A confirmation screen appears.

   Caution

   • An error screen appears in the following conditions:

     • The "Name" does not satisfy the input conditions

     • The total for the "Number of Generations" exceeds the maximum number for each model

     • Encrypted SDPVs are not created when the NAS user volumes are encrypted (or when the total capacity of the encrypted area in the SDP is "0") (*1)

     • Unencrypted SDPVs are not created when the NAS user volumes are not encrypted (or when the total capacity of the unencrypted area in the SDP is "0") (*1)

       *1

       :

       Refer to the [Snap Data Pool] function for details about the total capacity of encrypted and unencrypted areas in the SDP.

3. Click the [OK] button.

   → The snapshot setting starts.

4. Click the [Done] button to return to the [Snapshot] screen.

Snapshot Setting Modification

1. Select the NAS user volume to setup snapshot and click [Set Snapshot] in [Action].

2. Input the snapshot information, and click the [Set] button.

   → A confirmation screen appears.

   Caution

   • If the number of generations is reduced when changing the settings, a warning message appears.

   • An error screen appears in the following conditions:

     • The total for the "Number of Generations" exceeds the maximum number for each model

     • SDVs for additional generations cannot be created (the maximum number of volumes has already been created)

     • SDVs for additional generations cannot be created (insufficient capacity)

     • The number of generations is smaller than the number of snapshot sessions (when "Manual" is selected for "Mode")

3. Click the [OK] button.

   → The snapshot setting starts.

4. Click the [Done] button to return to the [Snapshot] screen.