[ZFS] Server periodically become unavailable

[Vladislav Prodan]

>FreeBSD 9.1-PRERELEASE #0: Wed Jul 25 01:40:56 EEST 2012     

I have the server: 8 cores AMD, 16GB RAM, 4x3TB HDD in RAID10 for ZFS.
Sometime wheels fall off the server and the network.
Can this clean-up memory for ZFS cache?
I enclose a picture with the monitoring system at the time lags.

http://imageshack.us/a/img341/9643/memoryusage.png
http://imageshack.us/a/img22/6935/nginxclientstat.png
http://imageshack.us/a/img19/8817/realmemory.png

#cat /etc/sysctl.conf
kern.ipc.somaxconn=65535
kern.ipc.maxsockets=204800
net.inet.ip.portrange.first=1024
net.inet.ip.portrange.last=65535
kern.ipc.shmmax=67108864
kern.ipc.shmall=67108864
net.inet.tcp.rfc3465=0
net.graph.maxdgram=8388608
net.graph.recvspace=8388608
net.route.netisr_maxqlen=4096
kern.ipc.nmbclusters=400000
kern.ipc.maxsockbuf=83886080
net.inet.tcp.recvbuf_inc=524288
net.inet.tcp.recvbuf_max=16777216
net.inet.tcp.sendbuf_inc=524288
net.inet.tcp.sendbuf_max=16777216
net.inet.tcp.sendspace=65536
net.inet.tcp.keepidle=300000
net.inet.tcp.keepintvl=60000
net.inet.ip.fw.dyn_max=65535
net.inet.ip.fw.dyn_buckets=65536
net.inet.ip.fw.dyn_ack_lifetime=120
net.inet.ip.fw.dyn_syn_lifetime=10
net.inet.tcp.nolocaltimewait=1
security.bsd.hardlink_check_uid=1
security.bsd.hardlink_check_gid=1
security.bsd.see_other_uids=0
security.bsd.see_other_gids=0


-- 
Vladislav V. Prodan            
System & Network Administrator 
http://support.od.ua           
+380 67 4584408, +380 99 4060508
VVP88-RIPE