Gionatan Danti
2015-Jun-27 16:18 UTC
Questions about hardlinks, alternate storage and compression
Hi all, I have some questions about hardlinks, alternate storage and compression. I already scanned the list for related information and I have an idea of how things works, but I would like to have a definite answer. System spec: - CentOS 6.6 x64 - dovecot-2.0.9-8.el6_6.4.x86_64 RPM package/version - sdbox mail store 1) About hardlinks: when sending the same message to two different recipients, I see that the two u.x files are created as two different files. Diffing them, I see that the only difference is a single char (see [1] for an example). My questions are: a) it is possible to tell dovecot to create a single file + a single hardlink (linkref=2)? As other IMAP servers support that features (eg: Cyrus, CommunigatePro, etc) I am wondering if I missed something in configuring dovecot... b) If it is not possible, can I run a script that compare the various files and substitute equal ones (minus the changing line) with hardlinks, or it will confuse dovecot? As a side note, why the changing line ever exists? 2) About alternate storage and compression: actually, I use a single mail_location without compression. I would like to have an alternate storage and to enable compression on it only, leaving the main location without compression. I if understand it correctly, it _should_ be done using a command similar to "doveadm -Dv -o "plugin/zlib_save=gz" altmove -uu testuser sentbefore 8d". I'm right thinking that it should work? I will really end with a primary uncompressed mail store and an alternate, zlib-compressed one? Thank you all and sorry if I did some naive questions. [1] 63c63 < G2fd0811c64be8e553d970000eaa8309f ---> G2ed0811c64be8e553d970000eaa8309f-- Danti Gionatan Supporto Tecnico Assyoma S.r.l. - www.assyoma.it email: g.danti at assyoma.it - info at assyoma.it GPG public key ID: FF5F32A8
Gionatan Danti
2015-Jun-29 09:20 UTC
Questions about hardlinks, alternate storage and compression
Hi all, any ideas? Especially point n.1 (no hardlink when sending the same email to multiple addresses) confuse me a bit. Searching in old messages I even stumbled on some users stating that, using Dovecot LMTP server, they achieved what I want (one messagge, multiple hardlinks), but I am _already_ using LMTP with no avail... Regards. On 27/06/15 18:18, Gionatan Danti wrote:> Hi all, > I have some questions about hardlinks, alternate storage and > compression. I already scanned the list for related information and I > have an idea of how things works, but I would like to have a definite > answer. > > System spec: > - CentOS 6.6 x64 > - dovecot-2.0.9-8.el6_6.4.x86_64 RPM package/version > - sdbox mail store > > 1) About hardlinks: when sending the same message to two different > recipients, I see that the two u.x files are created as two different > files. Diffing them, I see that the only difference is a single char > (see [1] for an example). My questions are: > a) it is possible to tell dovecot to create a single file + a single > hardlink (linkref=2)? As other IMAP servers support that features (eg: > Cyrus, CommunigatePro, etc) I am wondering if I missed something in > configuring dovecot... > b) If it is not possible, can I run a script that compare the various > files and substitute equal ones (minus the changing line) with > hardlinks, or it will confuse dovecot? As a side note, why the changing > line ever exists? > > 2) About alternate storage and compression: actually, I use a single > mail_location without compression. I would like to have an alternate > storage and to enable compression on it only, leaving the main location > without compression. I if understand it correctly, it _should_ be done > using a command similar to "doveadm -Dv -o "plugin/zlib_save=gz" altmove > -uu testuser sentbefore 8d". I'm right thinking that it should work? I > will really end with a primary uncompressed mail store and an alternate, > zlib-compressed one? > > Thank you all and sorry if I did some naive questions. > > [1] > 63c63 > < G2fd0811c64be8e553d970000eaa8309f > --- >> G2ed0811c64be8e553d970000eaa8309f > > >-- Danti Gionatan Supporto Tecnico Assyoma S.r.l. - www.assyoma.it email: g.danti at assyoma.it - info at assyoma.it GPG public key ID: FF5F32A8
Gionatan Danti
2015-Jul-06 16:37 UTC
Questions about hardlinks, alternate storage and compression
Sorry list, anyone with a good idea / suggestion? Thanks. Il 29-06-2015 11:20 Gionatan Danti ha scritto:> Hi all, > any ideas? > > Especially point n.1 (no hardlink when sending the same email to > multiple addresses) confuse me a bit. Searching in old messages I even > stumbled on some users stating that, using Dovecot LMTP server, they > achieved what I want (one messagge, multiple hardlinks), but I am > _already_ using LMTP with no avail... > > Regards. > > On 27/06/15 18:18, Gionatan Danti wrote: >> Hi all, >> I have some questions about hardlinks, alternate storage and >> compression. I already scanned the list for related information and I >> have an idea of how things works, but I would like to have a definite >> answer. >> >> System spec: >> - CentOS 6.6 x64 >> - dovecot-2.0.9-8.el6_6.4.x86_64 RPM package/version >> - sdbox mail store >> >> 1) About hardlinks: when sending the same message to two different >> recipients, I see that the two u.x files are created as two different >> files. Diffing them, I see that the only difference is a single char >> (see [1] for an example). My questions are: >> a) it is possible to tell dovecot to create a single file + a >> single >> hardlink (linkref=2)? As other IMAP servers support that features (eg: >> Cyrus, CommunigatePro, etc) I am wondering if I missed something in >> configuring dovecot... >> b) If it is not possible, can I run a script that compare the >> various >> files and substitute equal ones (minus the changing line) with >> hardlinks, or it will confuse dovecot? As a side note, why the >> changing >> line ever exists? >> >> 2) About alternate storage and compression: actually, I use a single >> mail_location without compression. I would like to have an alternate >> storage and to enable compression on it only, leaving the main >> location >> without compression. I if understand it correctly, it _should_ be done >> using a command similar to "doveadm -Dv -o "plugin/zlib_save=gz" >> altmove >> -uu testuser sentbefore 8d". I'm right thinking that it should work? I >> will really end with a primary uncompressed mail store and an >> alternate, >> zlib-compressed one? >> >> Thank you all and sorry if I did some naive questions. >> >> [1] >> 63c63 >> < G2fd0811c64be8e553d970000eaa8309f >> --- >>> G2ed0811c64be8e553d970000eaa8309f >> >> >>-- Danti Gionatan Supporto Tecnico Assyoma S.r.l. - www.assyoma.it email: g.danti at assyoma.it - info at assyoma.it GPG public key ID: FF5F32A8
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