n is either 0, 1, or 2.
AsyncMemberType indicates whether the async member is a disaster recovery (DR), read-only reporting, or read-write reporting async member.
0 - Disaster Recovery (DR). This is a disaster recovery async member. All its mirrored databases are read-only mirrored databases.
1 - Read-Only Reporting. This is a reporting async member. All its mirrored databases could be read-only or read-write databases. The default is read-only when the database is created.
2 - Read-Write Reporting. This is a reporting async member. All its mirrored databases could be read-only or read-write databases. The default is read-write when the database is created.
For more information, see the Async Mirror Members section of the chapter “Mirroring” in the High Availability Guide
Changing This Parameter
On the Join as Async page of the Management Portal (System Administration > Configuration > Mirror Settings > Join as Async), fill in Mirror Information and select Next. On the page Async Member Information, in the Async Member System Type row, select a type from the drop-down list.
Instead of using the Management Portal, you can change AsyncMemberType in the Config.MirrorMember class (as described in the class reference) or by editing the CPF in a text editor (as described in the Editing the Active CPF section of the “Introduction to the Configuration Parameter File” chapter in this book).