zabbix on SmartOS zone with postgres

postgresql.conf

max_connections = 100                   
shared_buffers = 512MB                  
work_mem = 32MB                         
maintenance_work_mem = 256MB            
bgwriter_lru_maxpages = 0
synchronous_commit = off
wal_buffers = 8MB
checkpoint_segments = 32                
checkpoint_timeout = 60min              
checkpoint_completion_target = 0.9      
seq_page_cost = 4.2                     
effective_cache_size = 1024MB
datestyle = 'iso, mdy'
lc_messages = 'en_US.UTF-8'                     
lc_monetary = 'en_US.UTF-8'                     
lc_numeric = 'en_US.UTF-8'                      
lc_time = 'en_US.UTF-8'                         
default_text_search_config = 'pg_catalog.english'

server.specs

Running on SmartOS Zone / Solaris

"System Type": "SunOS"
 MiB of Memory": "3072"
"ZFS Quota": "100G"
"CPU Total Cores": 2

Memory Usage is: 

RSS(MB)  CAP(MB)
1369     3072  

Cpu is maybe 15-20% utilized

Zabbix Version = 2.0.5
Zabbix Hosts = 230
Required server performance = 84.17
Postgres DB Size = 30GB
Postgres Version = 9.1.9

zabbix_server.conf

LogFile=/tmp/zabbix_server.log
LogFileSize=100
DBName=zabbixdb
DBUser=zabbixdba
DBPassword=myzabbpass
CacheSize=32M
HistoryCacheSize=128M
TrendCacheSize=16M
HistoryTextCacheSize=64M
SenderFrequency=5
StartPollers=15
StartPollersUnreachable=5
StartPingers=20
StartDBSyncers=2
StartHTTPPollers=2
AlertScriptsPath=/opt/zabbix/share/zabbix/alertscripts
Timeout=15
FpingLocation=/opt/local/bin/fping