Hi, Currently postgres allows setting any value for max_wal_size or min_wal_size, not enforcing "at least twice as wal_segment_size" limit [1]. This isn't a problem if the server continues to run, however, the server can't come up after a crash or restart or maintenance or upgrade (goes to a continuous restart loop with FATAL errors [1]).
How about we add GUC check hooks for both max_wal_size and min_wal_size where we can either emit ERROR or WARNING if values are not "at least twice as wal_segment_size"? Thoughts? [1] FATAL: "max_wal_size" must be at least twice "wal_segment_size" FATAL: "min_wal_size" must be at least twice "wal_segment_size" [2] ./initdb -D data ./pg_ctl -D data -l logfile start ./psql -c "alter system set max_wal_size='2MB'" postgres ./psql -c "alter system set min_wal_size='2MB'" postgres ./psql -c "select pg_reload_conf()" postgres ./pg_ctl -D data -l logfile restart Regards, Bharath Rupireddy.
