> On 05/04/2024 13:26 EEST Marc <m...@f1-outsourcing.eu> wrote:
>
>
> > >
> > >
> > > > > > breaking the mail index
> > > > >
> > > > > Tangentially query: is Dveocot smart enough to optimize mailbox
> > > > renaming
> > > > > to do index renaming (i.e. does not try to copy or recreate
> > indices)?
> > > > >
> > > >
> > > > Dovecot is, if you use LAYOUT=index. This will use only mailbox GUID
> > on
> > > > disk, and the folder name is only in indexes (both list index and
> > mailbox
> > > > index for recovery purposes).
> > > >
> > > > I would recommend using 2.3.21 with LAYOUT=index to avoid problems.
> > > >
> > >
> > > So you can just add this to an existing configuration, without the need
> > to do anything? Like eg reindex or so? I always had the impression this
> > affects how messages are stored.
> > >
> > > mail_location = mdbox:xxxxxx:INDEX=xxxxxx:CONTROL=/xxxxxxx
> > > becomes:
> > > mail_location = mdbox:xxxxxx:INDEX=xxxxxx:CONTROL=/xxxxxxx:LAYOUT:index
> > >
> > > Does this really speed things up?
> > >
> >
> > You can't put it on existing setup just like that, you need to do storage
> > format migration, or copy all the folders into their GUID folders when
> > you do this.
> >
> > It will speed things up and will also allow you to use almost anything as
> > mailbox name.
> >
>
> I was in the process of setting up new server, it already had a few test
> mailboxes on it.
>
> why do you mention this specific version 2.3.21? el9 still is at 2.3.16.
>
Because we have fixed issues with index layout since 2.3.16. It will work with
2.3.16 too but there are issues you'd probably not want to deal with, most
importantly:
- LAYOUT=index List index rebuild was missing.
- LAYOUT=index: Duplicate GUIDs were not detected.
which were added in 2.3.17 and futher fixed in later versions. It's a chore to
dig up specific versions, so I recommend using the latest.
> So if I add the LAYOUT:index to mail_location for my mdbox setup, it only
> renames Drafts,INBOX,Junk etc to some uuid (I guess)?
>
> ├── mdbox
> │ ├── dbox-alt-root
> │ ├── mailboxes
> │ │ ├── Drafts
> │ │ │ └── dbox-Mails
> │ │ ├── INBOX
> │ │ │ ├── dbox-Mails
> │ │ │ └── test
> │ │ │ └── dbox-Mails
> │ │ ├── Junk
> │ │ │ └── dbox-Mails
> │ │ ├── NotSpam
> │ │ │ └── dbox-Mails
> │ │ ├── Sent
> │ │ │ └── dbox-Mails
> │ │ └── Trash
> │ │ └── dbox-Mails
> │ └── storage
> │ ├── m.1
> │ ├── m.2
> │ ├── m.3
> │ ├── m.4
> │ ├── m.5
> │ └── m.6
>
> This server is offline any way. What would be the easiest way to do this
> migration? Something I can do directly on this server?
If there are only few accounts, you can configure new mail location with
LAYOUT=index and use doveadm sync / backup to migrate mails there, then move
things over the old stuff - or copy old stuff elsewhere and do the same to
current location as new.
Aki
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