When performing hot plug actions on components, ensure that all I/O activity to the component has been stopped before proceeding with the hot plug action. If not, this could lead to interrupted service or data loss.
Hot plug actions can be performed on the following components related to storage:
Hard disk drives. Before performing hot plug actions, use the HBA management software or OS utilities to isolate a storage module drive and take it offline. If supported, the blue Ready-to-Remove light on the drive will be lit when the drive is ready to be removed.
Storage module. There is no way to isolate all drives in the storage module at once. Drives must be isolated individually using the HBA management software or OS utilities. Planning for server downtime is the easiest way to prevent accidental data loss.
SAS–2 NEM. The best way to ensure there is no interruption in service or accidental data loss when a SAS-2 NEM is removed is to have two SAS-2 NEMs installed in the chassis. Additionally, ensure that the appropriate multipath drivers are installed if your servers are not using a hardware RAID solution. Specific instructions for performing hot plug actions with a SAS-2 NEM are included in the NEM documentation.
Server module. Planning for server downtime is the safest way to prevent accidental data loss when hotplugging a server module.
Note - As a precaution, you should always back up your data before performing hot plug actions. Also, ensure that you have a back up of the most recent host-to-storage assignments which is stored in your CMM ILOM configuration backup file (see Assigning Storage to Hosts for more information).