Error when exporting mailboxes to tgz

[nameless']

Hello,

Every night, I'm doing a backup of my user's mailboxes, with the GetRest method.

With that, I'm able to restore a single mailboxe, in case of any problem.

The problem is that since I updated ZCS from 6.0.8 to 6.0.12, I have some problems with this method. My script stops unexpectly without any error, and more or less randomly.

I spotted theses errors on my logfiles, don't know if it could be the problem or not :

2011-05-19 00:05:50,371 WARN  [btpool0-522://mail.domain.com/home/endiaye@domain.com/?fmt=tgz] [name=enaye@domain.com;mid=100;ip=192.168.x.x;] misc - Archive Formatter warning: com.zimbra.common.service.ServiceException: system failure: archive error
ExceptionId:btpool0-522://mail.domain.com/home/enaye@domain.com/?fmt=tgz:1305756350371:aa5047f2b9e20093
2011-05-19 01:26:13,895 WARN  [btpool0-579://mail.domain.com/home/emarchis@domain.com/?fmt=tgz] [name=emarchais@domain.com;mid=132;ip=192.168.x.x;] misc - Archive Formatter warning: com.zimbra.common.service.ServiceException: system failure: archive error
ExceptionId:btpool0-579://mail.domain.com/home/emarchais@domain.com/?fmt=tgz:1305761173895:aa5047f2b9e20093
2011-05-19 01:32:44,887 WARN  [btpool0-576://mail.domain.com/home/gmeunier@domain.com/?fmt=tgz] [name=gmier@domain.com;mid=24;ip=192.168.x.x;] log - SSL renegotiate denied: java.nio.channels.SocketChannel[connected local=/192.168.x.x:443 remote=/192.168.x.x:34395]
2011-05-19 01:32:44,888 WARN  [btpool0-576://mail.domain.com/home/gmier@domain.com/?fmt=tgz] [name=gmier@domain.com;mid=24;ip=192.168.x.x;] misc - Archive Formatter warning: com.zimbra.common.service.ServiceException: system failure: archive error

And I also have a lot of :

com.zimbra.cs.taglib.bean.ZTagLibException: java.io.IOException: Stream closed
Code:ztaglib.TAG_EXCEPTION
        at com.zimbra.cs.taglib.bean.ZTagLibException.TAG_EXCEPTION(ZTagLibException.java:58)
Caused by: org.mortbay.io.RuntimeIOException: java.io.IOException: Stream closed
Caused by: java.io.IOException: Stream closed

My server is a DELL R410, 2 x XEON 5600, with 16GB RAM, 2x500GB SATA drives, running ESXI 4.1.

My Zimbra is running in a VM with 10GB RAM and 500GB VMDK.

The average load is 0.5, it raise up to @ 2.0 when the backup job is running.

Apart from this VM, I only have 2 others VM running on this host, but the average load is 0.3, they don't work a lot...


Any idea ?

[nameless']

Nobody ?