Error Code: [19:857] Description: Check whether keyless ssh is enabled between MDT and the Data Access Node

A Lustre backup operation fails with an error message that says keyless ssh might not be enabled.

Symptoms

A Lustre backup operation fails with the following error message:

Error Code: [19:857] Description: Check whether keyless ssh is enabled between MDT and the Data Access Node.Cannot note down the end of changelog record number for MDT lustrewt-MDT0000 on Host 172.19.66.175. Changelog ID cl12. Error : Error=774, Command ssh root@172.19.66.175 'lctl get_param mdd.lustrewt-MDT0000.changelog_users' failed with Error Host key verification failed. (W32.774) Source: mrtest03-namechange, Process: FileScan

Causes

Keyless ssh is not set up between the MDT server and the data access nodes.

Resolution

Set up keyless ssh between the MDT server and the data access nodes.