Set default effective_io_concurrency and random_page_cost to SSD values

Since all the drives with DBs on them are SSDs, set these GUCs to values
more appropriate to a generic SSD. NVMe drives could have even higher
concurrency, but this is a reasonable start.

cookbooks/postgresql/attributes/default.rb

@@ -9,7 +9,7 @@
 default[:postgresql][:settings][:defaults][:work_mem] = "4MB"
 default[:postgresql][:settings][:defaults][:maintenance_work_mem] = "64MB"
 default[:postgresql][:settings][:defaults][:max_stack_depth] = "2MB"
-default[:postgresql][:settings][:defaults][:effective_io_concurrency] = "1"
+default[:postgresql][:settings][:defaults][:effective_io_concurrency] = "256"
 default[:postgresql][:settings][:defaults][:max_worker_processes] = "8"
 default[:postgresql][:settings][:defaults][:max_parallel_workers_per_gather] = "2"
 default[:postgresql][:settings][:defaults][:max_parallel_workers] = "8"
@@ -30,7 +30,7 @@
 default[:postgresql][:settings][:defaults][:hot_standby] = "on"
 default[:postgresql][:settings][:defaults][:hot_standby_feedback] = "off"
 default[:postgresql][:settings][:defaults][:seq_page_cost] = "1.0"
-default[:postgresql][:settings][:defaults][:random_page_cost] = "4.0"
+default[:postgresql][:settings][:defaults][:random_page_cost] = "1.1"
 default[:postgresql][:settings][:defaults][:cpu_tuple_cost] = "0.01"
 default[:postgresql][:settings][:defaults][:effective_cache_size] = "4GB"
 default[:postgresql][:settings][:defaults][:default_statistics_target] = "100"

roles/eddie.rb

@@ -19,9 +19,7 @@
         :shared_buffers => "64GB",
         :work_mem => "64MB",
         :maintenance_work_mem => "1GB",
-        :effective_cache_size => "180GB",
-        :effective_io_concurrency => "256",
-        :random_page_cost => "1.1"
+        :effective_cache_size => "180GB"
       }
     }
   },

roles/karm.rb

@@ -25,9 +25,8 @@
         :shared_buffers => "64GB",
         :work_mem => "64MB",
         :maintenance_work_mem => "1GB",
-        :effective_cache_size => "180GB",
-        :effective_io_concurrency => "256",
-        :random_page_cost => "1.1"
+        :effective_cache_size => "180GB"
+
       }
     }
   },

roles/prometheus.rb

@@ -9,7 +9,6 @@
         :shared_buffers => "48GB",
         :work_mem => "8MB",
         :maintenance_work_mem => "2GB",
-        :effective_io_concurrency => "200",
         :max_worker_processes => "67",
         :max_parallel_workers_per_gather => "28",
         :max_parallel_workers => "56",

roles/snap-01.rb

@@ -25,9 +25,7 @@
         :shared_buffers => "128GB",
         :work_mem => "128MB",
         :maintenance_work_mem => "2GB",
-        :effective_cache_size => "360GB",
-        :effective_io_concurrency => "256",
-        :random_page_cost => "1.1"
+        :effective_cache_size => "360GB"
       }
     }
   },

roles/snap-02.rb

@@ -19,9 +19,7 @@
         :shared_buffers => "128GB",
         :work_mem => "128MB",
         :maintenance_work_mem => "2GB",
-        :effective_cache_size => "360GB",
-        :effective_io_concurrency => "256",
-        :random_page_cost => "1.1"
+        :effective_cache_size => "360GB"
       }
     }
   },

roles/snap-03.rb

@@ -25,9 +25,7 @@
         :shared_buffers => "128GB",
         :work_mem => "128MB",
         :maintenance_work_mem => "2GB",
-        :effective_cache_size => "360GB",
-        :effective_io_concurrency => "256",
-        :random_page_cost => "1.1"
+        :effective_cache_size => "360GB"
       }
     }
   },

roles/tile.rb

@@ -46,7 +46,6 @@
         :commit_delay => "10000",
         :max_wal_size => "2880MB",
         :max_wal_senders => "0",
-        :random_page_cost => "1.1",
         :jit => "off",
         :track_activity_query_size => "16384",
         :autovacuum_vacuum_scale_factor => "0.05",