Hi,

No hints about vsz_limit values?

Anyone?

Thanks, Nick

On 16/12/2011 11:09 πμ, Nikolaos Milas wrote:

Hello,

I would like to ask on suggested vsz_limit values.

Is there any way of calculating such values? How should we determine them? I don't want to risk wrong values (and possible errors) on a production system, if I upgrade to 2.0.16 where vsz_limit values are enforced (I read release notes)!

If there is no standard way of calculation, could someone please check the following info and suggest some values?

I am running dovecot-2.0.13-1_128.el5 x86_64 RPM on CentOS 5.7 (as a VM on a KVM Host).

All accounts are virtual, hosted on LDAP Server. We have about 250 mailboxes of 4GB each (in practice, only a couple of mailboxes ever reach 1GB so we are "over-booking"). It is a relatively low-load server.

Memory status and config follows below.

Thanks, Nick

The server memory condition is as follows:

vmstat

procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 0 0 92 62400 212324 1299604 0 0 397 235 70 39 4
2 89 4 0

free -m

         total       used       free     shared    buffers     cached

Mem: 2010 1951 59 0 207 1269 -/+ buffers/cache: 474 1536 Swap: 2015 0 2015

---------- Config Start -------------

2.0.13: dovecot.conf

protocols = imap pop3

mail_location = maildir:~/Maildir/ mail_gid = 500 mail_uid = 500

auth_mechanisms = plain login auth_username_format = %Lu auth_verbose = yes disable_plaintext_auth = no

mail_plugins = quota

protocol imap { imap_client_workarounds = "delay-newmail " mail_plugins = quota imap_quota }

protocol pop3 { mail_max_userip_connections = 3 mail_plugins = quota pop3_client_workarounds = outlook-no-nuls oe-ns-eoh pop3_uidl_format = %08Xu%08Xv }

protocol lda { auth_socket_path = /var/run/dovecot/auth-master info_log_path = log_path = mail_plugins = quota postmaster_address = sysadmin@example.com sendmail_path = /usr/lib/sendmail }

userdb { args = /etc/dovecot/dovecot-usrdb-ldap.conf driver = ldap }

passdb { args = /etc/dovecot/dovecot-passdb-ldap.conf driver = ldap }

plugin { quota = maildir:User quota quota_rule = *:storage=4G quota_rule2 = Trash:storage=+3%% quota_warning = storage=75%% quota-warning 75 %u quota_warning2 = storage=90%% quota-warning 90 %u }

service quota-warning { executable = script /opt/mail1.sh user = vmail unix_listener quota-warning { user = vmail } }

service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } unix_listener auth-master { group = vmail mode = 0660 user = vmail } user = root }

service imap-login { service_count = 1 vsz_limit = 64 M }

service pop3-login { service_count = 1 vsz_limit = 64 M }

ssl_ca = </etc/pki/CA/certs/chain.pem ssl_cert = </etc/pki/CA/certs/cert.pem ssl_key = </etc/pki/CA/private/key.pem

syslog_facility = local1

---------- Config End -------------