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It seems that we are using both, the redis server and the db server as redis services, from web-01 and web-02:
# web-01 root@quarry-web-01:/srv/quarry# grep REDIS_HOST quarry/config.yaml REDIS_HOST: 'quarry-db-01.quarry.eqiad.wmflabs' # web-02 root@quarry-web-02:~# grep REDIS_HOST /srv/quarry/quarry/config.yaml REDIS_HOST: 'quarry-redis-01.quarry.eqiad1.wikimedia.cloud'
This blocks deleting the db-01 and replacing it with trove.