Apple Mac OS X Server Migration For Version 10.3 or Later Manuel d'utilisateur télécharger pdf (Page 12)

12 Chapter 1 Mail Service Setup

Where Mail Is Stored

Mail is stored in either an outgoing queue awaiting transfer to a remote server or in a

local mail store accessible by local mail users.

Outgoing Mail Location

Outgoing mail messages are stored, by default, in the following spool directory on the

startup disk:

/var/spool/postfix

This location is temporary, and the mail is stored until it’s successfully transferred out to

the Internet. These locations can be moved to any accessible volume (either local or

NFS mounted) and symlinked to by the mail administrator.

Incoming Mail Location

The mail service keeps track of incoming email messages with a small database

(BerekeleyDB.4.1), but the database doesn’t contain the messages themselves. The mail

service stores each message as a separate file in a mail folder for each user. Incoming

mail is stored on the startup disk in the following directory:

/var/spool/imap/[user name]

Cyrus puts a database index file in the folder of user messages. You can change the

location of any or all of the mail folders and database indexes to another folder, disk, or

disk partition. You can even specify a shared volume on another server as the location

of the mail folder and database, although using a shared volume incurs performance

penalties. The incoming mail remains on the server until deleted by an MUA.

Maximum Number of Mail Messages per Volume

Because the mail service stores each email message in a separate file, the number of

messages that can be stored on a volume is determined by the total number of files

that can be stored on the volume.

The total number of files that can be stored on a volume that uses Mac OS Extended

format (sometimes referred to as HFS Plus format) depends on the following factors:

• The size of the volume

• The sizes of the files

• The minimum size of a file, which by default is one 4K block

For example, a 4 GB HFS Plus volume with the default block size of 4KB has one million

available blocks. This volume could hold up to a million 4KB files, which means a

million email messages that were 4KB or less apiece. If some email messages were

larger than 4KB, this volume could hold fewer of them. A larger volume with the same

default block size could hold proportionately more files.

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Apple Mac OS X Server Migration For Version 10.3 or Later Manuel d'utilisateur Page 12