Zabbix agent unracheable every 4 to 6 hours

[akarim]

Hi.

I'm desesperate.

My Zabbix server lost connections with all server each 4 or 6 hours.

It's a little installation.

Zabbix server is running Yes zabbix.tamainut.net:10051
Number of hosts (monitored/not monitored/templates) 77 38 / 12 / 27
Number of items (monitored/disabled/not supported) 7031 2491 / 56 / 4484
Number of triggers (enabled/disabled)[problem/unknown/ok] 1194 1194 / 0 [25 / 0 / 1169]
Number of users (online) 3 2
Required server performance, new values per second 30.35

I thonk aproblem whit mysql beacuse after restart work fine..

Logs show...

11822:20130506:070756.790 [Z3005] query failed: [1317] Query execution was interrupted [insert into history (itemid,clock,value,ns) values ......

/etc/my.cnf

[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
max_connections=250


symbolic-links=0
#innodb_file_per_table = 1
thread_concurrency = 4
query_cache_size = 64M
thread_cache_size = 8
myisam_sort_buffer_size = 64M
read_rnd_buffer_size = 8M
read_buffer_size = 2M
sort_buffer_size = 2M
table_cache = 512
max_allowed_packet = 1M
key_buffer = 256M
join_buffer_size = 256k
innodb_buffer_pool_size = 3G
innodb_lock_wait_timeout = 500
innodb_flush_method = O_DIRECT
innodb_thread_concurrency = 4

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

The number of server and item for monitoring it's not big...

I'm lost... apreciate help.

[Colttt]

please more exactly..

please post the complete logfile-line
and what is "not big" ?
what kind of serverhardware do you have?

[akarim]

Screen of Zabbix Dasboard.

https://docs.google.com/file/d/0BwTAn45qcvZIM0x1dlpDZXRFaTg/edit?usp=drive_web

Not too big?

Required server performance, new values per second 30.35

Sure. On past put more servers (server, vps, and system) with a lot of item and not problem. Requirements (values per second 150) and not problem. Now little installation, crash.

4 Cores Intel i3 2130 | 6 GB Ram Sata-II Disk (It's over VPS KVM on a Host machine with out another VPS active)