[LUDOC-497] Snapshot tools may fail when #targets > MaxStartups in sshd_config

Thu, 4 Nov 2021 00:18:58 +0000

When using ssh as the remote shell for zfs-based lustre snapshots, servers with large numbers of targets may fail to create snapshots on all relevant zfs datasets. A new ssh connection is attempted for each target, and when the total reaches the default maximum number of concurrent unauthenticated connections (10), there is a chance the next connection will be killed.

The solution suggested for ~~LU-9368~~ works for me: make sure that the MaxStartups value in /etc/ssh/sshd_config is at larger than the number of targets on the server.

Can a note about this appear in the documentation or man pages? It took me an embarrassingly long time to track it down.

Whamcloud Community JIRA

[LUDOC-497] Snapshot tools may fail when #targets > MaxStartups in sshd_config