Hardware manual

Group Administration Advanced volume operations
10–4
• Because the group bases snapshot space and replication space on a percentage of the volume reserve, disabling
thin provisioning increases snapshot space and replication space. Therefore, you must have sufficient free pool
space.
• In some cases, if you disable thin provisioning on a volume,
the
group automatically decreases the snapshot
reserve percentage to prevent an excessive allocation of snapshot space.
This can occur if you previously set the snapshot reserve
percentage to a high value to prevent the group from
deleting snapshots (for example, if you increased the snapshot reserve percentage from 100% to 500%). If you
disable thin provisioning on the volume, the group might decrease the percentage to a more appropriate value,
closer to 100%. The group does not decrease the snapshot reserve percentage if the decrease requires deleting
snapshots.
To disable thin provisioning on a volume:
1. Click
Volumes, then expand Volumes, then select the volume, then click Modify settings, and then click
the
Space tab.
2. In the Modify volume settings – Space dialog box,
de-select Thin-provisioned volume.
The Pool Space table values change, based on the new volume setting.
If the volume change exceeds pool
capacity, the free space cell displays a negative value.
3. Click
OK.
Modifying the thin provisioning space settings
You can modify the thin provisioning space settings that are described in Thin provisioning space settings on page
10-2.
1. Click
Volumes, then expand Volumes, then select the volume, then click Modify settings, and then click
the
Space tab.
2. In the Modify volume settings – Space dialog box, use the sliders to adj
ust the settings for:
• Minimum volume reserve
• In-use space warning limit
• Maximum in-use space (maximum volume reserve
)
The Pool Space table values change, based on
the new values. If a change exceeds capacity, the free pool space
cell displays a negative value.
3. Click
OK.