Re: [Dovecot] Some POP3 questions
On Tue, May 5, 2009 at 11:39 PM, Timo Sirainen t...@iki.fi wrote: On Tue, 2009-05-05 at 23:32 +0200, Kenneth Kalmer wrote: * NFS server which is the same server that houses single Courier-IMAP installation (Gentoo, 3GB memory) * 2x Postfix instances delivering to NFS NFS may be problematic. Dovecot expects a perfectly working NFS setup, which seems to be a bit rare to find. http://wiki.dovecot.org/NFS Just for the record, dovecot will be access the mail directly on the disks, it will be the LDA's on the postfix instances coming in over NFS. I'm reading the NFS again to make sure I understand the risks If the LDA is Dovecot deliver, it's the same problem since it also updates index/control files that cause the problems. But if you're using something else that does nothing but write the maildir files, then it's fine. I'm looking to use the Dovecot LDA so the caches are updated and the filenames are correct, to get good POP3 performance. I'm looking forward to giving Dovecot a go, but I'll rig up a staging environment first. Thanks for the encouraging responses everyone. Best -- Kenneth Kalmer kenneth.kal...@gmail.com http://opensourcery.co.za @kennethkalmer
Re: [Dovecot] Some POP3 questions
On Wed, May 6, 2009 at 5:25 AM, Kenneth Kalmer kenneth.kal...@gmail.com wrote: On Tue, May 5, 2009 at 11:39 PM, Timo Sirainen t...@iki.fi wrote: On Tue, 2009-05-05 at 23:32 +0200, Kenneth Kalmer wrote: * NFS server which is the same server that houses single Courier-IMAP installation (Gentoo, 3GB memory) * 2x Postfix instances delivering to NFS NFS may be problematic. Dovecot expects a perfectly working NFS setup, which seems to be a bit rare to find. http://wiki.dovecot.org/NFS Just for the record, dovecot will be access the mail directly on the disks, it will be the LDA's on the postfix instances coming in over NFS. I'm reading the NFS again to make sure I understand the risks If the LDA is Dovecot deliver, it's the same problem since it also updates index/control files that cause the problems. But if you're using something else that does nothing but write the maildir files, then it's fine. I'm looking to use the Dovecot LDA so the caches are updated and the filenames are correct, to get good POP3 performance. I'm looking forward to giving Dovecot a go, but I'll rig up a staging environment first. Thanks for the encouraging responses everyone. Best -- Kenneth Kalmer kenneth.kal...@gmail.com http://opensourcery.co.za @kennethkalmer I moved from a 4 gig nfs server with eight mailheads running exim as lda, courier imap/pop3 (over nfs) to an 8 gig nfs server and moved to dovecot imap/pop3 running directly on the nfs server and dropped to four mailheads running exim with dovecot lda. At first I tried to keep my imap/pop3 services running on the 4 mailheads but over nfs had major weird 500 load spikes randomly, moving these to the nfs server solved all of that. The 4 mailheads still deliver to maildir over nfs using dovecot as lda. I have been pleasantly pleased. Our webmail app in our old setup used to take 10-30 seconds to load and now it is instantaneous. Some of it might be from upgrading hardware, but I definitely had a HUGE noticeable difference and you couldnt convince me to go back. We did have about a week of sucktastic traffic and my support department hating me because all our pop3 leave-messages-on-server users had to redownload all their mail, but it was worth the headache. Dovecot is just too sweet, with its performance and plugins to ever have to even think about a choice between it or software X. Just my $0.02
Re: [Dovecot] Some POP3 questions
On Wed, May 6, 2009 at 7:23 AM, Brandon Lamb brandonl...@gmail.com wrote: On Wed, May 6, 2009 at 5:25 AM, Kenneth Kalmer kenneth.kal...@gmail.com wrote: On Tue, May 5, 2009 at 11:39 PM, Timo Sirainen t...@iki.fi wrote: On Tue, 2009-05-05 at 23:32 +0200, Kenneth Kalmer wrote: * NFS server which is the same server that houses single Courier-IMAP installation (Gentoo, 3GB memory) * 2x Postfix instances delivering to NFS NFS may be problematic. Dovecot expects a perfectly working NFS setup, which seems to be a bit rare to find. http://wiki.dovecot.org/NFS Just for the record, dovecot will be access the mail directly on the disks, it will be the LDA's on the postfix instances coming in over NFS. I'm reading the NFS again to make sure I understand the risks If the LDA is Dovecot deliver, it's the same problem since it also updates index/control files that cause the problems. But if you're using something else that does nothing but write the maildir files, then it's fine. I'm looking to use the Dovecot LDA so the caches are updated and the filenames are correct, to get good POP3 performance. I'm looking forward to giving Dovecot a go, but I'll rig up a staging environment first. Thanks for the encouraging responses everyone. Best -- Kenneth Kalmer kenneth.kal...@gmail.com http://opensourcery.co.za @kennethkalmer I moved from a 4 gig nfs server with eight mailheads running exim as lda, courier imap/pop3 (over nfs) to an 8 gig nfs server and moved to dovecot imap/pop3 running directly on the nfs server and dropped to four mailheads running exim with dovecot lda. At first I tried to keep my imap/pop3 services running on the 4 mailheads but over nfs had major weird 500 load spikes randomly, moving these to the nfs server solved all of that. The 4 mailheads still deliver to maildir over nfs using dovecot as lda. I have been pleasantly pleased. Our webmail app in our old setup used to take 10-30 seconds to load and now it is instantaneous. Some of it might be from upgrading hardware, but I definitely had a HUGE noticeable difference and you couldnt convince me to go back. We did have about a week of sucktastic traffic and my support department hating me because all our pop3 leave-messages-on-server users had to redownload all their mail, but it was worth the headache. Dovecot is just too sweet, with its performance and plugins to ever have to even think about a choice between it or software X. Just my $0.02 Oh yea, and I just recently discovered the virtual mailbox plugin and fell even more in love. I am developing a Gmail clone inhouse for our new webmail (we're an ISP). It is cool plugins like this that make me glad I switched to Dovecot. Being able to consolidate various Deleted, Trash, Deleted Items, Deleted Mails folders all into a single virtual/Trash folder is GREAT.
Re: [Dovecot] Some POP3 questions
By the way, you can download ready to use open-source mail, calendar, contacts, etc: http://www.6zap.com. I'am sysadm in this project and we use dovecot to. On Wed, 05/06/2009 at 5:28pm, Brandon Lamb brandonl...@gmail.com wrote: On Wed, May 6, 2009 at 7:23 AM, Brandon Lamb brandonl...@gmail.com wrote: On Wed, May 6, 2009 at 5:25 AM, Kenneth Kalmer kenneth.kal...@gmail.com wrote: On Tue, May 5, 2009 at 11:39 PM, Timo Sirainen t...@iki.fi wrote: On Tue, 2009-05-05 at 23:32 +0200, Kenneth Kalmer wrote: * NFS server which is the same server that houses single Courier-IMAP installation (Gentoo, 3GB memory) * 2x Postfix instances delivering to NFS NFS may be problematic. Dovecot expects a perfectly working NFS setup, which seems to be a bit rare to find. http://wiki.dovecot.org/NFS Just for the record, dovecot will be access the mail directly on the disks, it will be the LDA's on the postfix instances coming in over NFS. I'm reading the NFS again to make sure I understand the risks If the LDA is Dovecot deliver, it's the same problem since it also updates index/control files that cause the problems. But if you're using something else that does nothing but write the maildir files, then it's fine. I'm looking to use the Dovecot LDA so the caches are updated and the filenames are correct, to get good POP3 performance. I'm looking forward to giving Dovecot a go, but I'll rig up a staging environment first. Thanks for the encouraging responses everyone. Best -- Kenneth Kalmer kenneth.kal...@gmail.com http://opensourcery.co.za @kennethkalmer I moved from a 4 gig nfs server with eight mailheads running exim as lda, courier imap/pop3 (over nfs) to an 8 gig nfs server and moved to dovecot imap/pop3 running directly on the nfs server and dropped to four mailheads running exim with dovecot lda. At first I tried to keep my imap/pop3 services running on the 4 mailheads but over nfs had major weird 500 load spikes randomly, moving these to the nfs server solved all of that. The 4 mailheads still deliver to maildir over nfs using dovecot as lda. I have been pleasantly pleased. Our webmail app in our old setup used to take 10-30 seconds to load and now it is instantaneous. Some of it might be from upgrading hardware, but I definitely had a HUGE noticeable difference and you couldnt convince me to go back. We did have about a week of sucktastic traffic and my support department hating me because all our pop3 leave-messages-on-server users had to redownload all their mail, but it was worth the headache. Dovecot is just too sweet, with its performance and plugins to ever have to even think about a choice between it or software X. Just my $0.02 Oh yea, and I just recently discovered the virtual mailbox plugin and fell even more in love. I am developing a Gmail clone inhouse for our new webmail (we're an ISP). It is cool plugins like this that make me glad I switched to Dovecot. Being able to consolidate various Deleted, Trash, Deleted Items, Deleted Mails folders all into a single virtual/Trash folder is GREAT. Powered by the 6zap. Sign up at http://www.6zap.com for an account that provides advanced e-mail, calendar and contacts capabilities.
Re: [Dovecot] Some POP3 questions
On Ter, 2009-05-05 at 15:41 +0200, Kenneth Kalmer wrote: Hi everyone () Long stories short, will Dovecot with the Postfix/LDA give performance equal than Courier-IMAP or improved (because of the cached message sizes)? Improved without a doubt. But I advise you to go to the latest available version (masked or not). -- Jose Celestino SAPO.pt::Systems http://www.sapo.pt - * Progress (n.): The process through which Usenet has evolved from smart people in front of dumb terminals to dumb people in front of smart terminals.
Re: [Dovecot] Some POP3 questions
Long stories short, will Dovecot with the Postfix/LDA give performance equal than Courier-IMAP or improved (because of the cached message sizes)? Another thing you want to look at is the UIDLsetting in dovecot.conf, if it doesn't match the one in Courier, then people with leave mail on server will download all their email again (once) because the UIDL list is different. Just my 2 cents...goodluck Sincerely, Wouter van der Schagt
Re: [Dovecot] Some POP3 questions
On Tue, May 5, 2009 at 3:57 PM, Wouter van der Schagt wou...@vdschagt.comwrote: Long stories short, will Dovecot with the Postfix/LDA give performance equal than Courier-IMAP or improved (because of the cached message sizes)? Another thing you want to look at is the UIDLsetting in dovecot.conf, if it doesn't match the one in Courier, then people with leave mail on server will download all their email again (once) because the UIDL list is different. Which, to some extent, is almost what they deserve for storing their mail ;) Thanks for the pointer, will make a note quickly Best -- Kenneth Kalmer kenneth.kal...@gmail.com http://opensourcery.co.za @kennethkalmer
Re: [Dovecot] Some POP3 questions
On May 5, 2009, at 9:41 AM, Kenneth Kalmer wrote: As for the system layout, it looks like this: * NFS server which is the same server that houses single Courier-IMAP installation (Gentoo, 3GB memory) * 2x Postfix instances delivering to NFS NFS may be problematic. Dovecot expects a perfectly working NFS setup, which seems to be a bit rare to find. http://wiki.dovecot.org/NFS So I'd do some testing before moving all the users.
Re: [Dovecot] Some POP3 questions
On Tue, May 5, 2009 at 5:34 PM, Timo Sirainen t...@iki.fi wrote: On May 5, 2009, at 9:41 AM, Kenneth Kalmer wrote: As for the system layout, it looks like this: * NFS server which is the same server that houses single Courier-IMAP installation (Gentoo, 3GB memory) * 2x Postfix instances delivering to NFS NFS may be problematic. Dovecot expects a perfectly working NFS setup, which seems to be a bit rare to find. http://wiki.dovecot.org/NFS Just for the record, dovecot will be access the mail directly on the disks, it will be the LDA's on the postfix instances coming in over NFS. I'm reading the NFS again to make sure I understand the risks Thanks -- Kenneth Kalmer kenneth.kal...@gmail.com http://opensourcery.co.za @kennethkalmer
Re: [Dovecot] Some POP3 questions
On Tue, 2009-05-05 at 23:32 +0200, Kenneth Kalmer wrote: * NFS server which is the same server that houses single Courier-IMAP installation (Gentoo, 3GB memory) * 2x Postfix instances delivering to NFS NFS may be problematic. Dovecot expects a perfectly working NFS setup, which seems to be a bit rare to find. http://wiki.dovecot.org/NFS Just for the record, dovecot will be access the mail directly on the disks, it will be the LDA's on the postfix instances coming in over NFS. I'm reading the NFS again to make sure I understand the risks If the LDA is Dovecot deliver, it's the same problem since it also updates index/control files that cause the problems. But if you're using something else that does nothing but write the maildir files, then it's fine. signature.asc Description: This is a digitally signed message part
