On Fri, 28 Mar 2025 08:36:08 +0100 Florian Piekert via Postfix-users <postfix-users@postfix.org> wrote:
> Hello Paul, > > is there the chance of storage hardware failures? Or VPS I/O issues > in case it is on a VPS? > Hi, seems unlikely. My first guess was also slowed I/O due to backup. But now backup is over and I/O (no notable I/O wait) looks fine. mdadm and (filesystem(ext4) is on a RAID 10 using 4 SATA-HDDs) smart data seems ok. nothing at all in dmesg. But i noticed following on restart of dovecot: systemd[1]: Started Dovecot IMAP/POP3 email server. dovecot[5393]: master: Dovecot v2.2.36 (1f10bfa63) starting up for imap, pop3 (core dumps disabled) dovecot[5393]: master: Error: file_dotlock_open(/var/lib/dovecot/instances) failed: Resource temporarily unavailable but looking through old logfiles it showed up for a long time before I had issues. I added the following to dovecot-config: conf.d/10-mail.conf:# used only with INBOX when either its initial creation or dotlocking fails. conf.d/10-mail.conf:# Rely on O_EXCL to work when creating dotlock files. NFS supports O_EXCL conf.d/10-mail.conf:dotlock_use_excl = yes conf.d/10-mail.conf:# Locking method for index files. Alternatives are fcntl, flock and dotlock. conf.d/10-mail.conf:# Dotlocking uses some tricks which may create more disk I/O than other locking conf.d/10-mail.conf:lock_method = dotlock conf.d/10-mail.conf:# dotlock: Create <mailbox>.lock file. This is the oldest and most NFS-safe conf.d/10-mail.conf:# dotlock_try: Same as dotlock, but if it fails because of permissions or conf.d/10-mail.conf:mbox_write_locks = dotlock fcntl error message still present - but the issue seems to be resolved. flooded my mailbox with command mail and did imap lists simultaneously. hope this was it. Thank you Paul > > Am 28.03.2025 um 07:50 schrieb Paul Neuwirth via Postfix-users: > > Hello group, > > > > Since a few days I have massive problems with lockfiles blocking the > > mailboxes (type storage, /var/mail/user). > > don't know if it's the right list. may more concern dovecot. > > > > postqueue is full of > > 944C223FC2 17905 Fri Mar 28 06:02:01 XXX > > (cannot update mailbox /var/mail/pane for user XXX. unable to create > > lock file /var/mail/XXX.lock: File exists) XXX > > > > 6530223FC9 3597 Fri Mar 28 06:11:46 XXX > > (cannot update mailbox /var/mail/XXX for user XXX. unable to lock > > for exclusive access: Resource temporarily unavailable) XXX > > > > and messages get delivered, but after ages. > > > > most of the time lsof /var/mail/XXX shows one to two processes of > > dovecot/imap > > > > There were no configuration changes at the point the problem > > started. > > > > Do you have ideas or tips how to debug this further? > > or should I look for a dovecot mail list? > > > > Thank you > > > > Paul _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
