[Dovecot] regarding dovecot.index.cache

[Dhaval Thakar]

Hi,

This is regarding updating dovecot.index.cache.
I have few backup ids configured. these are used only when old mail 
needs to be retrieved.
usually these mailboxes contains more then 9,000 mails.

while login to webmail, imap consumption is high, which creates 
performance related issues for regular mailboxes.
to resolve this i have to move heavy mailbox to dedicated server.
before doing that, I wanted to confirm if there any way to update 
dovecot.index.cache even if user is not checking his / her mails.

kindly confirm, & provide direction to implement same.

Following is the mailserver related details
Qmail with Vpopmail 5.4.24
Dovecot-1.1.4

 dovecot -n
# 1.1.4: /etc/dovecot/dovecot.conf
protocols: imap
ssl_disable: yes
disable_plaintext_auth: no
login_dir: /usr/local/var/run/dovecot/login
login_executable: /usr/local/libexec/dovecot/imap-login
mail_plugins: quota imap_quota trash
imap_client_workarounds: delay-newmail outlook-idle
namespace:
  type: private
  prefix: INBOX.
  inbox: yes
  list: yes
  subscriptions: yes
auth default:
  mechanisms: plain login
  verbose: yes
  debug: yes
  debug_passwords: yes
  passdb:
    driver: checkpassword
    args: /home/vpopmail/bin/vchkpw
  userdb:
    driver: vpopmail
  userdb:
    driver: prefetch
plugin:
  quota: maildir
  quota_rule: Trash:ignore

thanks & regards
dhaval