What the LDR service is

Hosted by a Storage Node, the Local Distribution Router (LDR) service handles content transport for the StorageGRID Webscale system. Content transport encompasses many tasks including data storage, routing, and request handling. The LDR service does the majority of the StorageGRID Webscale system’s hard work by handling data transfer loads and data traffic functions.

The LDR service handles the following tasks:

For general information about the LDR serviceʹs role in the management of objects, see the Grid Primer.


Overview page for LDR service

Queries

LDR queries include queries for object location during retrieve and archive operations. You can identify the average time that it takes to run a query, the total number of successful queries, and the total number of queries that failed because of a timeout issue.

You can review query information to monitor the health of the key data store, Cassandra, which impacts the system’s ingest and retrieval performance. For example, if the latency for an average query is slow and the number of failed queries due to timeouts is high, the data store might be encountering a higher load or performing another operation.

You can also view the total number of queries that failed because of consistency failures. Consistency level failures result from an insufficient number of available distributed key value stores at the time a query is performed through the specific LDR service.

ILM Activity

Information Lifecycle Management (ILM) metrics allow you to monitor the rate at which objects are evaluated for ILM implementation. Some of these metrics are also visible on the Dashboard.