manual

8 www.microsoft.com/sharepoint
method would allow you to backup a Office SharePoint Server 2007 database and attach
it to your SharePoint Server 2010 Web application, SharePoint Server would then
upgrade this database and make it available through the Web application. Additionally
there is support for single click installations to be upgraded by using in-place upgrade,
and then migrated from a Windows Internal Database deployment to take advantage of
remote BLOB storage (RBS, covered later in this guide).
Downtime Mitigation
Several features have been introduced in SharePoint Server 2010 to allow for upgrade to
occur with little to no outages and at the same time to allow for quicker upgrade
windows.
The first feature is the use of read-only databases, which was made available starting
with Office SharePoint Server 2007 Service Pack 2. SharePoint Server 2010 now
recognizes a content database has been made read-only from within SQL Server and will
trim the user interface as if all site collections were marked read-only. This allows users
read access to the content while the upgrade takes place.
Another advancement to reduce the amount of time an upgrade will take is that
SharePoint Server 2010 supports performing several database attach upgrades at the
same time. Through the use of multiple Windows PowerShell sessions, multiple
databases are upgraded. which means the amount of data upgraded at one time is
limited only by your SQL Server resources.
Finally, for customers who have such extreme amounts of content that completing the
upgrade within a reasonable window is not possible, there is another option. This option
involves using alternate access mapping redirections to direct traffic between a
SharePoint Server 2010 farm and Office SharePoint Server 2007 farm based on the
requested URL by using client-side 302 redirects.
Visual Upgrade
To mitigate the impact of the upgrade on the user community, SharePoint Server 2010
supports Office SharePoint Server 2007 master pages and cascading style sheets. By
default, after a content database is upgraded, the sites will be displayed with the Office
SharePoint Server 2007 visuals, giving the user their familiar look and feel. An upgraded
site can then exist in one of three states: Office SharePoint Server 2007, SharePoint
Server 2010 preview mode, and SharePoint Server 2010. This allows the site