Seagate ST11200N Technical Information PDF herunterladen (Seite 54)

Configuring Tape Drives

Automatic Configuration

When a tape drive is configured using NetBackup, NetBackup will automatically issue the

chdev command to configure the drive to use extended file marks. It is normally not

necessary to manually run the chdev command, but the details of the command issued by

NetBackup are provided (see “Using the chdev Command” on page 40).

Using the chdev Command

Ensure that the device being used is configured for extended file marks as required by

Media Manager by using the chdev command as follows:

/usr/sbin/chdev -l

Dev

-a extfm=yes

Where Dev is the logical identifier for the drive (for example: rmt0 or rmt1)

Fast-Tape Positioning (locate-block)

For AIT, DLT, Exabyte, and half-inch cartridge tape drives, Media Manager supports the

SCSI locate-block command for positioning tape to a specific block. This improves

tape-positioning greatly over what can be obtained with the alternative.

Media Manager uses the locate-block command by default unless you disable it by

executing the following:

touch /usr/openv/volmgr/database/NO_LOCATEBLOCK

With locate-block positioning disabled, NetBackup uses the

forward-space-file/record method.

Creating No Rewind Device Files

When adding tape drives to a Media Manager configuration, you need only specify a no

rewind on close device path. These SCSI device files are in the /dev directory and have

the following format:

/dev/rmt

Where ID is the logical identifier assigned to the device by the system.

▼ To check for and create the necessary device files

1. Display which SCSI controllers are physically available by using the lsdev command

as follows:

/usr/sbin/lsdev -C | grep I/O

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

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Seagate ST11200N Technical Information Seite 54