Re: New Server Hardware

On 21 Jul 2016, at 18:06, Nicolas Hatier wrote:

> mdir has the issue of not being indexed.

In a sense, with mdir the filesystem IS the index. Each message is a 
single RC822-format text file with its name encoding the message's IMAP 
UID, multiple status flags, time of receipt (IMAP "INTERNALDATE") and 
line count.

> Opening a large mailbox with several thousands of messages may take a 
> while, it all depends on the filesystem.

Also on the ability of the OS to efficiently cache directory 
information, which is a mix of how much memory pressure there is, system 
tuning, and which filesystem is used.

> All other operations are very fast. And it's very handy for 
> incremental backups.

Also, because each message is in its own file in standard RFC822 format 
with a name that carries significant metadata, mdir is especially 
convenient for external tools. For example, I have a simple script that 
feeds messages into the SpamAssassin learning subsystem as spam when a 
user moves them into a folder with a particular name. Without mdir that 
script would need to figure out how to extract individual messages from 
mslc or mbox files and how to know which messages are the new ones.

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