Dell EqualLogic PS6210XS EqualLogic Group Manager Administrator s Guide PS Ser - Page 228

The Modify volume settings dialog box opens. 4. In the dialog box, click Space. In the Snapshot Space section, modify the following values as needed: • Snapshot reserve - The reserve is the amount of space allocated to snapshot storage for the volume. It is expressed as a percentage of the volume's size. For example, if the volume size is 100GB and the snapshot reserve is 100 (the default), an additional 100GB of space will be allocated for snapshot storage. Changes to the amount of snapshot reserve space are immediately reflected in the Snapshot Reserve bar below, which shows the amount of free and used space. • Snapshot space warning percentage - The sliding pointer on the Snapshot Reserve bar determines how much snapshot reserve space will be consumed before a warning is issued that the volume is running out of snapshot reserve space. Click and drag the pointer to slide it to a new position. The default value is 90 percent. 5. Click OK. NOTE: To change the groupwide default values for both the snapshot space reserve and the warning percentage: 1. Click Group → Group Configuration. 2. Click the Defaults tab. 3. In the Snapshot space reserve section of the Volume Settings panel, modify the settings as needed. Settings specified here apply to newly created volumes only, not to existing volumes. Modify Snapshot Space Recovery Policy To modify the snapshot space recovery policy: 1. Click Volumes. 2. Expand Volumes and then select the volume name. 3. In the Activities panel, below Snapshots click Modify snapshot policy. The Modify snapshot policy dialog box opens. 4. In the dialog box, select either Set volume offline or Delete oldest snapshot. If you select Delete oldest snapshot, you also have the option of selecting Borrow snapshot space as needed. 5. Click OK. NOTE: To change the groupwide default values for the snapshot space recovery policy: 1. Click Group → Group Configuration. 2. Click the Defaults tab. 3. In the Snapshot space recovery section of the Volume Settings panel, modify the settings as needed. Settings specified here apply to newly created volumes only, not to existing volumes. Create a Snapshot You can create a snapshot of a single volume at the current time. Snapshot creation occurs immediately, with no impact on volume availability or performance. 1. Click Volumes. 2. Expand Volumes and then select the volume name. 3. In the Activities panel, click Create snapshot. The Create Snapshot dialog box opens. 4. (Optional) Type a description for the snapshot, up to 127 characters. Fewer characters are accepted for this field if you type the value as a Unicode character string, which takes up a variable number of bytes, depending on the specific character. 5. With the Set snapshot online checkbox, select whether to keep the snapshot offline (default) or set the snapshot online. 6. With the Make snapshot read-write checkbox, select whether to make the snapshot permission read-write (the default) or read-only. 7. Click OK. The snapshot appears in the far-left panel, under the volume name. The default snapshot name is the volume name followed by the date and time when you created the snapshot (for example, dbasevolume-2014-03-25-15:31:14.7668). Snapshots appear under a volume in the far-left panel listed by timestamp. 228 About Backing Up and Protecting Your Data