The Remote Availability Checks are performed from a defined (central) Simple Diagnostic Agent (SDA) located in the related Customer Network of the Managed System.

The selection of the central SDA based on three attempts:

1. If a host is maintained for a Customer Network in report RLMDB_CUSTOMER_NETWORK_TOOLS column “Hostname for Central Diagnostic Agent”, this SDA is used.
   1. Starting with SAP Focused Run 4.0 FP03 please maintain the central network agent in the "Network Maintenance" in the section "Agent Settings"
2. If an Enterprise Manager is available in the Customer Network the SDA on this host is used.
3. If both above are not available, a random online SDA is used.

For all three options it is checked, if the related SDA is online.

The active central SDA can be displayed in the Metric Details of the Remote Availability Check Metric:

• Info button on metric level
• Following the Link "Check Data Collection"
• Column Agent ### is responsible for the data collection.

Remark: currently, one central agent can approximately handle around 200 Remote Host pings with the standard collection frequency of 1 minute.

Starting with Simple Diagnostics Agent 1.64.3, users can now customize the maximum wait time for a ping response by adding/maintaining the relevant properties. For details please refer to 3454023 - FRUN Host Availability metric ping timeout customization. Alternatively, for Focused Run 4.0 release and above a timeout parameter value can be specified on the metric level. This requires the Rapid Content Delivery Version 12.
Remark: originally, this feature is introduced with SDA 1.64.0, but due to a bug requires a fix delivered with 1.64.3 patch (3500822 - Issue with metric Remote Host Ping - Timestamp 1 Jan 1970).