User's Manual

2.3
How VSS Works with Microsoft SQL Server
3PAR Recovery Manager 3.0.2 for Microsoft SQL Server User’s Guide
3PAR Confidential
Figure 2-1. 3PAR VSS Provider for Microsoft Windows Operation Overview
2.2 How VSS Works with Microsoft SQL Server
1 The requestor (Recovery Manager) sends a command to the Volume Shadow Copy service
to take a shadow copy of the selected Microsoft SQL Server database.
2 The Volume Shadow Copy service communicates with the Microsoft SQL Server with SQL
Writer. The Volume Shadow Copy service flushes the current log files to disk and suspends
any writes to the transaction log files and to the database file. However, read-only access is
still allowed so any data that is already in the SQL Server database can still be accessed from
the client.