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