db-koji01: some more tweaking to get better perf and stability

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

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

@@ -12,7 +12,7 @@ db_backup_dir: ['/backups']
 dbs_to_backup:
   - koji
 effective_cache_size: "100GB"
-effective_io_concurrency: 1
+effective_io_concurrency: 0
 eth0_ipv4_gw: 10.3.169.254
 eth0_ipv4_ip: 10.3.169.103
 # kernel SHMMAX value
@@ -24,10 +24,10 @@ lvm_size: 1750000
 max_cpu: 96
 max_mem_size: 327680
 max_parallel_maintenance_workers: 8
-max_parallel_workers: 40
-max_parallel_workers_per_gather: 40
+max_parallel_workers: 10
+max_parallel_workers_per_gather: 32
 max_stack_depth: "6MB"
-max_worker_processes: 40
+max_worker_processes: 64
 mem_size: 262140
 nagios_Check_Services:
   swap: false
@@ -37,7 +37,7 @@ nrpe_procs_crit: 700
 #
 nrpe_procs_warn: 600
 num_cpus: 72
-shared_buffers: "32GB"
+shared_buffers: "8GB"
 swap: false
 vmhost: bvmhost-x86-01.iad2.fedoraproject.org
 volgroup: /dev/vg_guests