zlib corrupted data

[Angel L. Mateo]

Hello,

	We are having performance problems with one of our users. We are having 
a server (2.1.16) for about 8000 users. This server is a vmware vm with 
8 cores and 32GB of RAM. Normally, it is working fine, but when one of 
our users access his email, then the load increases a lot and this high 
load is maintained while the user is connected.

	Looking for problems with this user I have found that trying to move 
messages from one folder to another I have errors like:

doveadm(mctm at um.es): Error: 
zlib.read(/mail/users/mailboxes/um.es/mc/mctm/mdbox/storage/m.1486): 
corrupted data at 30152376
doveadm(mctm at um.es): Error: 
zlib_istream.seek(/mail/users/mailboxes/um.es/mc/mctm/mdbox/storage/m.1486) 
failed: Invalid argument
doveadm(mctm at um.es): Error: 
zlib.read(/mail/users/mailboxes/um.es/mc/mctm/mdbox/storage/m.1473): 
corrupted data at 7175520
doveadm(mctm at um.es): Error: 
zlib_istream.seek(/mail/users/mailboxes/um.es/mc/mctm/mdbox/storage/m.1473) 
failed: Invalid argument


	but a doveadm dump of these files shows no problem.

	Is there any way to debug this problem? How could I fix it?

-- 
Angel L. Mateo Martínez
Sección de Telemática
Área de Tecnologías de la Información
y las Comunicaciones Aplicadas (ATICA)
http://www.um.es/atica
Tfo: 868887590
Fax: 868888337