Rajesh M wrote:

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Rajesh M wrote:

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eric

i studied LDA a bit

if i use lda that means all my 5000+ users' email index files will be continuously updated when every email arrives -- means a lot of writes to disk ... is that correct ? Yes, but I think you make it sound worse than it is. Updating the index as each email arrives doesn't involve rebuilding the whole index like what happens at login. It only updates what's there instead of rebuilding the whole thing. I can't speak from experience, but I expect

Rajesh M wrote: that it's very efficient, and you'll never notice any increased load on the machine. Perhaps the equivalent of adding journaling to a filesystem. You can ask the dovecot list to verify this.

Also, it just occurred to me that if you're using ext3, you should be sure to optimize the filesystem. Off hand, I'd use the noatime and nodiratime mount options (man mount) and dir_index filesystem option (man tune2fs).

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if yes then i dont want that since only around 200 or so people out of the above 5000 use webmail. Just to be clear, it affects all imap usage, not only webmail (although your uses may not use imap other than webmail).

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i will study a some more and revert I hope you can figure a way to try this out. I expect that QMT's move to dovecot in the future will include the deliver LDA, and your work here will be a big help getting us there.

Let me know if I can be of any further help.

-- -Eric 'shubes'

hi eric

few questions

i wil enable lda exclusively for this one 30 gb email box using .qmail file see the performance improvement .. is that ok ? I believe that would be fine.

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can i safely enable atime for this user maildir ? Sure. That's simply a performance consideration. I don't believe that atime is used for much of anything, so either atime or noatime is safe. noatime is just a little faster because the inode (where that piece of information is stored) doesn't need to be updated each time a file is accessed.

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thanks for your help Sure. I'm eager to see your results.

-- -Eric 'shubes'

hi eric

this is what i plan to do

as per http://wiki.dovecot.org/LDA/Qmail

i need to enter the following line in a .qmail file under the Maildir directory of the user |/var/qmail/bin/preline -f /usr/local/libexec/dovecot/deliver -d $EXT@$USER

the location is /usr/libexec/dovecot/deliver on my system.

i would add an email forward using qmailadmin web interface (which creates the .qmail file) and then manually edit the .qmail file and put the above line in it (so that ownership and permissions are taken care off)

That sounds ok. The permissions/ownership I'm seeing on .qmail files is: -rw------- 1 vpopmail vchkpw 101 Mar 26 2008 .qmail

now i would also need to edit the dovecot.conf file could you guide me on what changes do i need to dovecot.conf file ?

Others on this list would be more help than me regarding this. From the looks of it though (after browsing the dovecot.conf file, which is well documented btw) I don't think you'd need to change a thing. We'll certainly find out if that's the case or not. I'd just give it a go. Perhaps on a test account initially. ;)

-- -Eric 'shubes'