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BUG #: 55322 (SQLBUG_70)
A database, log, file or file group backup, which was backed up to multiple tape backup devices (otherwise known as a striped dump), may fail to restore if fewer devices are used on the RESTORE operation than were used on the BACKUP. An extra tape mount is requested that can never be satisfied.
Note that this problem occurs with either the native SQL Server RESTORE command, or with the Original Equipment Manufacturer (OEM) backup/restore solutions that utilize the SQL Server Virtual Backup Device Interface (VDI) API.
Restore using either a single backup device, or the same number of devices used to create the striped backup.
Microsoft has confirmed this to be a problem in SQL Server 7.0. This problem has been corrected in U.S. Service Pack 2 for Microsoft SQL Server 7.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
254561For more information, contact your primary support provider.
(http://support.microsoft.com/kb/254561/ )INF: How to Obtain Service Pack 2 for Microsoft SQL Server 7.0 and Microsoft Data Engine (MSDE) 1.0
SQL Server allows the use of multiple devices on BACKUP and RESTORE operations. This allows SQL Server to parallelize reads and writes during BACKUP and RESTORE operations thus improving BACKUP and RESTORE performance and throughput.
By way of example, in the case where a database backup was striped across four tape backup devices, and the media set consists of four tapes, SQL Server incorrectly requests the mount of a fifth tape.
The following example demonstrates the manifestation of this problem:
REFERENCESFor more information about backing up and restoring SQL Server databases, see the chapter titled "Backing Up and Restoring Databases" in the "Administering SQL Server" manual available in SQL Server 7.0 Books Online.