Mongos often go DOWN.

  mongodb, question

Two slices of 600G data, version 2.41
Mongos has two running on DELL R420 64G memory
Usually the disk IO is about 8M
However, before mongos hangs up, the disk IO is generally about 30M, and mongos does not have any error logs
DOWN time, on average once a week, not during the peak period.
I don’t know if you have encountered such a situation.

2.43 No, upgrade it