## 2.5.2.3 Estimating the Maximum Retention Time
How long will your SAP HANA system replication landscape survive in a disconnect scenario before running into a log full situation, when logreplay or logreplay\_readaccess is configured?
You can use the SAP HANA cockpit to get an estimation of the maximum retention time.
After opening the system replication tile from the system database overview page, the System Replication Overview section provides information either about the Estimated Log Full Time or the Estimated Log Retention Time .
The Estimated Log Full Time value shows you how much time is left before the primary system runs into a log full situation.
The Estimated Log Retention Time value shows you how much time is left before the primary system starts to overwrite the RetainedFree marked log segments making a full data shipping necessary for resync.
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For more information, open the LOG REPLAY tab and look at the Estimated Log Full Time and Estimated Log Retention Time columns. In this services list, one row is shown for each service that is relevant for replication, because it has its own persistence consisting of data and log volume. The calculation is based on the value of the logshipping\_max\_retention\_size parameter, the write load on the primary system (taken from the log backup size), and the available disk space. The columns provide the log retention details only for the log volumes.
For a full description of each column, see the table below:
| Column Name                        | Description                                                                                                                                                                                                                                                                   |
|------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Volume ID                          | The volume ID of the service                                                                                                                                                                                                                                                  |
| Volume Sub Path                    | The last two directories of the file system path where the log volume of this service is located                                                                                                                                                                              |
| Host                               | The host where the service is running                                                                                                                                                                                                                                         |
| Service                            | The relevant service for system replication (for example, indexserver, nameserver, xsengine). Only services that have their own persistence are relevant for replication.                                                                                                     |
| Port                               | The port number                                                                                                                                                                                                                                                               |
| DatabaseName                       | The database name                                                                                                                                                                                                                                                             |
| Estimated Log Retention Time:      | Maximum number of days or hours on which the logs can be retained to resync the primary and the secondary after the replication was interrupted without requiring a full data shipping                                                                                        |
| Estimated Log Full Time            | Maximum number of days or hours until the log volume runs full when created redo logs can no longer be reused                                                                                                                                                                 |
| Configured Log Retention Size (GB) | Determined by the value of the logshipping_max_retention_size parameter that is valid for this service. For example, the setting of this parameter in the indexserver.ini on the host on which the service is running overwrites the setting of this parameter in global.ini. |
| Log Backup Size per Day (GB)       | The maximum log backup size per day indicating which replication relevant write load occurred for this service.                                                                                                                                                               |
| Disk ID                            | Internal Device ID (optional information)                                                                                                                                                                                                                                     |
| Free Disk Space (GB)               | Optional information                                                                                                                                                                                                                                                          |