Dell PowerFlex 4.5.x Administration Guide

Place a fault set in maintenance mode

Place a fault set into maintenance mode in order to perform non-disruptive maintenance on the group of storage data servers (SDSs).

1. On the menu bar, click Block > Fault Sets.
2. In the list of fault sets, select the relevant fault set check box and click More Actions > Enter Maintenance Mode.
3. In the Enter Fault Set to Maintenance Mode dialog box, select one of the following maintenance mode options:
   • Instant — a node is temporarily removed without building a new copy of the data. During maintenance, the system only mirrors new writes. After maintenance is complete, the system applies the new writes to the node that was under maintenance.
   • Protected — a third copy is created before entering maintenance mode. This ensures that if there is a node failure where the second copy of SDS is required, there is still a full backup of the SDS. This leaves no room for discrepancy between the copies. More storage capacity from the node is required.
4. Click Enter Maintenance Mode.
5. Verify that the operation has finished and was successful, and click Dismiss.
6. Optionally, at the top right side of the toolbar, click the Running Storage Jobs icon to check maintenance mode status.