db-koji01: Some adjustments to avoid any outages

Using the 'fix outage' clause in freeze here. ;)

Basically adjust db-koji01 to use more memory and avoid
saturating i/o. With these settings, page loads look faster
and i/o is not saturated. We should try adding more cpus and such,
but that will require a reboot, so avoiding for now.

Signed-off-by: Kevin Fenzi <kevin@scrye.com>

inventory/host_vars/db-koji01.iad2.fedoraproject.org

@@ -27,7 +27,7 @@ max_parallel_maintenance_workers: 4
 max_parallel_workers: 16
 max_parallel_workers_per_gather: 2
 max_stack_depth: "6MB"
-max_worker_processes: 64
+max_worker_processes: 48
 mem_size: 262140
 nagios_Check_Services:
   swap: false
@@ -37,7 +37,7 @@ nrpe_procs_crit: 700
 #
 nrpe_procs_warn: 600
 num_cpus: 48
-shared_buffers: "8GB"
+shared_buffers: "30GB"
 swap: false
 vmhost: bvmhost-x86-01.iad2.fedoraproject.org
 volgroup: /dev/vg_guests

roles/postgresql_server/templates/postgresql.conf-15

@@ -143,7 +143,7 @@ temp_buffers = 8MB                      # min 800kB
 work_mem = 4MB
 maintenance_work_mem = 1GB              # min 1MB
 {% else %}
-work_mem = 64MB
+work_mem = 128MB
 maintenance_work_mem = 2GB              # min 1MB
 {% endif %}