Admin db node (dali) out of disk space (again)

Some zfs snapshots were cleaned up to free space. It's still growing fast due to sentry being a disk resource glouton.

• We decided to double its storage disk to 350G.

Another idea thrown in the air would be to send more snapshots to the backup machine and clean up the local snapshots (but the last one which is needed for zfs to continue working).

Refs. #4695 (closed)