How to Configure Dumpster in Exchange Server 2007

Transport Dumpster feature is only specific to the Hub Transport server. Most important thing to remember is that transport dumpster does not recover all the data, but some data only. For example, an email sent to the Hub Transport at the time of disaster may not be included in the transport dumpster.

Transport dumpster maintains a rolling queue of al email messages that are recently been delivered to users whose mailboxes are hosted on that CCR environment. During disaster and its recovery, transport dumpster redeliver those messages automatically.

Dumpster transport feature is enabled by default and can be disabled if not required. But If enabled, you must also take into account an increased disk I/O.

MaxDumpsterSizePerStorageGroup is the amount of space allocated to the storage group for messages within the dumpster. Microsoft recommends the value should be 1.5*the maximum message size. For example, if the maximum message size is 20MB, then dumpster value should ne 30MB. If no maximum message size is configured, then average message size can be considered to calculate dumpster value.

MaxDumpsterTime defines for how many days, hours, minutes and seconds a message will be stored in the dumpster. The default value is 7.0.0.0 which means 7 days, 0 hours, 0 minutes, 0 seconds. Microsoft recommends keeping these default values so no need to alter these values.

Get-transportconfig

 

Below command will set the Maximum dumpster size to 30MB.

Set-TransportConfig –MaxDumpsterSizePerStorageGroup 30MB

Below command will set the maximum dumpster time from 7 days to 6 days (DD.HH:MM.SS).

Set-TransportConfig –MaxDumpsterTime 6.6:0:0

Above values can also be set from the EMC.

1.  Expand the Organization Configuration.

2. Highlight the Hub Transport.

3. Select the Global Settings tab in the result pane and you will see the Transport Setting object.

4. Right click on Transport Settings and open its Properties..

Let us assume that message size is 20MB, which means that transport dumpster parameter will be set to 30MB. Mike has sent 8 emails to John which contains some attachment having 5MB in size each. Since dumpster size is set to 30MN, so only 6 emails will be stored in the dumpster before it reaches capacity.

Message#	From	To	Msg Size
1	Mike	John	5MB
2	Mike	John	5MB
3	Mike	John	5MB
4	Mike	John	5MB
5	Mike	John	5MB
6	Mike	John	5MB

When Mike will send the 7^th email, then first message will be removed from the transport dumpster, since only 30MB can be stored in the transport dumpster. Therefore, transport dumpster will look like below:-

Message#	From	To	Msg Size
2	Mike	John	5MB
3	Mike	John	5MB
4	Mike	John	5MB
5	Mike	John	5MB
6	Mike	John	5MB
7	Mike	John	5MB

Similar process will occur with the MaxDumpsterTime. Let us assume that MaxDumpsterTime value has been set to 5 days, which means that when new message will come, then old messages will be removed from the queue. Like below:-

Message#	From	To	Date	Msg Size
1	Mike	John	10th Feb.2010	5MB
2	Mike	John	11th Feb.2010	5MB
3	Mike	John	12th Feb.2010	5MB
4	Mike	John	13th Feb.2010	5MB
5	Mike	John	14th Feb.2010	5MB

Since MaxDumpsterTime parameter is set to 5 days, so only messages from last 5 days will be stored. When a new message will come on 15^th Feb.2010, then old message of 10^th Feb.2010 will be deleted as shown below:-

Message#	From	To	Date	Msg Size
2	Mike	John	11th Feb.2010	5MB
3	Mike	John	12th Feb.2010	5MB
4	Mike	John	13th Feb.2010	5MB
5	Mike	John	14th Feb.2010	5MB
6	Mike	John	15th Feb.2010	5MB