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 system drive loss or 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, consult the Hardware Installation and Maintenance Guide for your model of appliance.
Overview flowchart of StorageGRID appliance recovery

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

Warnings about Storage Node recovery

CAUTION:
Do 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 the ILM policy is configured to replicate a single copy only, and those objects are lost, they cannot be recovered. You must still perform the "Restoring object data to a storage volume" procedure to purge lost object information from the database. For more information about ILM policies, see the Administrator Guide.
Note: If you encounter a DDS alarm during recovery, see the Troubleshooting Guide for instructions to recover from the alarm by rebuilding Cassandra. After Cassandra is rebuilt, alarms should clear. If alarms do not clear, contact technical support.