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Configuring Tape Drives

Enabling SCSI Reserve/Release

This is a NetBackup Enterprise Server topic.

The VERITAS implementation of SCSI reserve/release protects data on a tape from

corruption by other applications in a shared drive (SSO) configuration.

▼ To enable SCSI reserve/release

1. Set the kernel parameter st_ats_enabled to zero. Using the SAM utility is the

easiest way to set this parameter.

Leaving this parameter set to ONE causes conflicts between the operating system and

NetBackup or Storage Migrator’s use of SCSI reserve/release commands.

2. Reboot your system.

Cautions with Using the HP-UX EMS Tape Device Monitor

This is a NetBackup Enterprise Server topic.

The Tape Device Monitor (dm_stape) of the Event Monitoring System (EMS) should be

configured to not run on hosts participating in a tape SAN configuration. Part of the EMS

service periodically polls the tape devices to monitor their condition. When this occurs

from one server while another server is using the tape device, it may interfere with

backup operations causing those operations to time out and abort.

The problem can be avoided in either of the following ways:

◆ If you want to completely disable EMS you can run the

/etc/opt/resmon/lbin/monconfig tool and select (K) kill (disable)

Monitoring.

◆ If the POLL_INTERVAL value in the

/var/stm/config/tools/monitor/dm_stape.cfg file is set to zero, EMS will

still run, but it will not log any events or poll the devices (that is, it will not send any

SCSI commands).

66 NetBackup Media Manager Device Configuration Guide for UNIX, Windows, and Linux

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Seagate ST11200N Información técnica Pagina 80