Imap makes out of memory errors !

[tdemeter]

Hi,

I have a big issue with in my Zimbra server.
I migrated from 32 to 64 bit, from centos 5.5 to centos 6.2.
The system is working fine, but the imap-ssl service makes out of memory errors and the zmmailboxd is always stopped. 30-50 times a day!
It's terrible...

I readed some forums of java_heap_space and the memory optimalizations, but the problem is still...

My system:

Zimbra Open Source edition, for redhat 6@64 bit

8 GB ram
Centos 6.2@64 bit


My memori options for zimbra:

zmlocalconfig | grep -i mailboxd_java
mailboxd_java_heap_new_size_percent = 20
mailboxd_java_heap_size = 2048
mailboxd_java_options = -server -Djava.awt.headless=true -Dsun.net.inetaddr.ttl= -XX:+UseConcMarkSweepGC -XX:PermSize=128m -XX:MaxPermSize=128m -XX:SoftRefLRUPolicyMSPerMB=1 -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCApplicationStoppedTime -XX:-OmitStackTraceInFastThrow

I changed the conccurrent imap connections from default 200 to 600 but still.

If i blocked the imaps service (via iptables) the zimbra is workign, but the imap is needed for us.

Any idea?

Best regards,

Tibor

[tdemeter]

cut from mailbox.log


2012-01-11 00:04:54,401 FATAL [ImapSSLServer-1] [] system - out of memory
java.lang.OutOfMemoryError: Java heap space
at java.lang.StringCoding$StringEncoder.encode(String Coding.java:232)
at java.lang.StringCoding.encode(StringCoding.java:27 2)
at java.lang.String.getBytes(String.java:946)
at org.apache.commons.codec.net.RFC1522Codec.encodeTe xt(RFC1522Codec.java:93)
at org.apache.commons.codec.net.BCodec.encode(BCodec. java:109)
at com.zimbra.cs.imap.ImapMessage.nstring2047(ImapMes sage.java:422)
at com.zimbra.cs.imap.ImapMessage.serializeStructure( ImapMessage.java:614)
at com.zimbra.cs.imap.ImapHandler.fetch(ImapHandler.j ava:3369)
at com.zimbra.cs.imap.ImapHandler.doFETCH(ImapHandler .java:3179)
at com.zimbra.cs.imap.ImapHandler.executeRequest(Imap Handler.java:425)
at com.zimbra.cs.imap.TcpImapHandler.processCommand(T cpImapHandler.java:111)
at com.zimbra.cs.tcpserver.ProtocolHandler.processCon nection(ProtocolHandler.java:199)
at com.zimbra.cs.tcpserver.ProtocolHandler.run(Protoc olHandler.java:140)
at java.util.concurrent.ThreadPoolExecutor$Worker.run Task(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)

Tibor