Creating Volumes

When you create a volume, you specify the volume size (reported size that is seen by initiators), snapshot reserve, access control information, and other attributes. An iSCSI target name will be automatically created for the volume.

To create a volume, click:

Volumes > Create volume

The Create Volume - General Settings dialog box appears (Figure 1: Create Volume - General Settings ).

Figure 1: Create Volume - General Settings

You can specify information in the following fields:

Click Next to display the Create Volume – Space Reserve dialog box (Figure 4: Create Volume - iSCSI Access Policy ).

Figure 2: Create Volume - Space Reserve

Specify information in the following fields:

  • Minimum volume reserve – This is the minimum amount of space to allocate to the volume. As the volume is used, more space will be allocated to the volume, and the volume reserve will increase. The default is 10% of the volume size.
  • In-use space warning value – When in-use space reaches this value, as a percentage of the volume size, a warning event message is generated. The warning informs you that volume space is being used, enabling you to make adjustments, as needed. The default is the group-wide volume setting, as described in Modifying the Group-Wide Volume Settings.
  • Maximum in-use space value – When the in-use space reaches this value, as a percentage of the volume size, the volume is set offline.The default is the group-wide volume setting.
  • See Understanding Thin Provisioning for more information.

    Figure 3: Volume Create - Space Reserve - Thin-Provisioned Volume

    The values in the storage pool space tables shown in Figure 2: Create Volume - Space Reserve and Figure 3: Volume Create - Space Reserve - Thin-Provisioned Volume change to show how creating the volume will affect the pool space utilization, as described in Table 1: Storage Pool Space Table Values for Volumes.

    Table 1: Storage Pool Space Table Values for Volumes

    Space

    Description

    New Value

    Volume reserve (same as the reported size for volumes without thin provisioning enabled)

    Current amount of pool space allocated to volumes

    New amount of pool space allocated to volumes after creating the new volume

    Snapshot reserve

    Current amount of pool space allocated to snapshots of all volumes

    New amount of pool space allocated to all snapshots after adding new volume

    Replication reserve

    Current amount of pool space allocated to local replication reserve for all volumes

    New amount of pool space allocated to local replication reserve after adding new volume.

     

    No change for a new volume.

    Delegated space

    Pool space delegated to replication partners

    New amount of pool space delegated to replication partners after adding new volume.

     

    No change for a new volume.

    Free pool space

    Space in the pool not used or reserved for any purpose

    New amount of free, unused, unreserved pool space after adding new volume

    If creating the volume will exceed the capacity of the pool, the table cell showing free pool space will turn red.

    Click Next to display the Create Volume – iSCSI Access Policy dialog box (Figure 4: Create Volume - iSCSI Access Policy ), which enables you to create an access control record for the volume.

    Figure 4: Create Volume - iSCSI Access Policy

    Access control records are used to restrict volume access to hosts that supply a recognized CHAP user name and password (or "secret") or that match an IP address or iSCSI initiator name (or any combination of the three).

    To create an access control record that will apply to the volume and its snapshots, in the Create Volume – iSCSI Access Policy dialog box, click Restricted access and one or more of the following:

    Note: If using IP addresses or iSCSI initiator names to restrict access, be sure to create an access control record for each IP address or iSCSI initiator name presented by an authorized host.

    If you do not want to create an access control record at this time, select No access. No host will be allowed access to the volume until you create a record. You can set up access control records or modify records after creating the volume, as described in Managing Access Controls for Volumes and Snapshots.

    After specifying the access information, click Next to display the Create Volume - Summary dialog box (Figure 5: Create Volume - Summary ).

    Figure 5: Create Volume - Summary

    If the configuration is correct, click Finish to create the volume. To make changes, click Back.