On 2018-11-16 07:24, Adrian Minta wrote:
Yes, multiple imap servers using one shared nfs storage. With the same
config on 2.2.13 the public interface traffic was similar to the
storage interface, around 100 mbps.
After we switch to 2.2.27 the storage interface traffic jumped 10
times while the public interface stayed the same. This make us
thinking that something is wrong and each time a user logs in the
whole Inbox content is read by dovecot.
What you are suggesting goes against the documentations and it may not
be save, but I will give a thought.
I was expecting you have multiple IMAP servers using the same shared NFS
storage, however my question was: are the *individual mailboxes* on that
share accessed *at the same time* from more than one IMAP server?
--
Adi Pircalabu
On 11/15/18 6:23 AM, Adi Pircalabu wrote:
Are you connecting to the same mailbox over NFS from multiple IMAP
servers? If not and, at any given time, any mailbox will be accessed
from a single NFS client, try to "dupe" Dovecot into thinking it's not
using NFS. We're running quite successfully such setup with NFSv3 over
TCP, which turned out to be the fastest and most reliable throughout
the years. Here are the mount options:
rw,noatime,nodiratime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,nordirplus,proto=tcp,timeo=600,retrans=2,sec=sys,mountvers=3,mountport=1892,mountproto=tcp,local_lock=none
On the Dovecot side we're running with:
lock_method = dotlock
mail_fsync = never
mail_nfs_index = no
mail_nfs_storage = no
maildir_very_dirty_syncs = yes
mmap_disable = yes
protocol lda {
mail_fsync = optimized
}
protocol lmtp {
mail_fsync = optimized
}
Note: we're using Maildir and the usual "works for me(c), may not work
for everyone" applies.
