Disabling the Test Unit Ready request

Article:HOWTO56216  |  Created: 2011-07-25  |  Updated: 2012-01-24  |  Article URL http://www.symantec.com/docs/HOWTO56216
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Disabling the Test Unit Ready request

This topic relates to tuning Windows systems for NetBackup.

For tape libraries on a SAN with the tape drives that are shared among several media servers: disable the Test Unit Ready (TUR) functionality for the tape device drivers. For instructions, refer to the following Microsoft article:

Windows Server 2003 cannot perform backup jobs to tape devices on a storage area network

http://support.microsoft.com/kb/842411

The TUR requests affect NetBackup when it uses the Shared Storage Option (SSO) for tape drives. With SSO and TUR, any Windows media server may send SCSI commands to the drives to check whether they are ready. In SSO configurations, another host may need a tape drive: any SCSI commands that are sent from another server would interfere. As a result, backup and restore operations experience problems such as slow performance or even failures.

See About tuning Windows for NetBackup.


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