Recovering a StorageGRID Webscale appliance Storage Node

The procedure for recovering a failed StorageGRID Webscale appliance Storage Node is the same whether you are recovering from the loss of the system drive or from the loss of storage volumes only. You must prepare the appliance and reinstall software, configure the node to rejoin the grid, reformat storage, and restore object data.

About this task

For hardware maintenance procedures, such as instructions for replacing a controller, see the installation and maintenance instructions for your appliance.
Overview flowchart of StorageGRID appliance recovery

Each StorageGRID Webscale appliance is represented as one Storage Node in the StorageGRID Webscale system.

Notes for Storage Node recovery

CAUTION:
Do not perform this procedure if more than one Storage Node is offline, or if more than one Storage Node has a failure of any kind. Doing so might result in data loss. Contact technical support.
CAUTION:
Do not rebuild Cassandra on more than one Storage Node within a 15-day period. Rebuilding Cassandra on two or more Storage Nodes within 15 days of each other might result in data loss. Contact technical support.
Attention: If ILM rules are configured to store only one replicated copy and the copy exists on a Storage Node that has failed, you will not be able to recover the object. However, you must still perform the procedure to restore object data to a storage volume to purge lost object information from the database.
Note: If you encounter a DDS alarm during recovery, see troubleshooting instructions to recover from the alarm by rebuilding Cassandra. After Cassandra is rebuilt, alarms should clear. If alarms do not clear, contact technical support.