Your E-mail server usually does not get much attention until there is a problem. Some offices institute mailbox size-limits to keep mailboxes within a general recommended size, but often many companies do not. You may have HLP’s bi-weekly or weekly service, and your technician comes out and makes sure that everything is okay. However, what does okay mean? How much mail can the server store? What happens to mail when it is deleted? What happens to a user’s mailbox when it is deleted? Does the server need any special maintenance? These are the common questions that people have about their mail server. We are going to concentrate Microsoft Exchange Server 2000 and Exchange Server 2003 to answer these questions.
Let us start with how an Exchange Server stores mail. The mail is stored in a database, which increases to accommodate the amount of mail; but when you delete a message, the size of the database does not decrease. Therefore, if you delete a user’s mailbox that was 1.5 gigabytes you do not instantly regain that storage space. The space is not available until an on-line defragment occurs. This typically happens automatically on Sunday for most servers. That space also still counts against the total size limit of the database.
Here lies the problem: if you have an Exchange Server Version 2000, your server can hold up to 16 gigabytes of mail. Once the database reaches 16 gigabytes YOUR SERVER, WILL NO LONGER SEND OR RECEIVE MAIL! Therefore, we have a file (the Exchange mail database file) that increases and it also has a size limit -- but it does not decrease! What can we do? Microsoft has a utility that allows you to defragment the database, which will restore it to its actual size, and it is free! With all of that said there is of course a downside; your mail will be down the entire time this process runs, and you need to have double the free disk space available to run the tool. For example if your database is 15 gigabytes then you need 30 gigabytes of free space. HLP offers all of our block customers a free loaner hard-drive for this process if you do not have enough space. The offline defragment usually takes about two and half hours, and this can be performed in the evening, and remotely so that a staff member does not have to stay behind. The defragment is also useful if your backups are starting to run onto two tapes, because it will decrease the amount of data backed up.
If you have an Exchange 2003 server with Service Pack 2, you have 75 gigabytes of mail storage capacity! Although, for backup purposes, you probably do not want to use all of that space, so a defragment can be helpful in this case as well.
Paula Crowell
Service Manager
HLP Associates, Inc.
www.hlp.net