May 25, 2020


Specifies the device attribute-value pairs to be used instead of the defaults. Specifies the connection location, indicated by the ConnectionLocation variable, on the parent. This flag cannot be used with the -d flag. Specifies the interval for a cleaning cycle. By default, Oracle Secure Backup allows all tapes in a library to be accessed by all drives in the library.

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If Oracle Secure Backup has to contend with other system software such as monitoring software for access to tape libraries and drives, then unexpected behavior can result.

This policy ensures that Oracle Secure Backup can always solicit a tape needed for restore by using both the barcode and the volume ID.

In the attachment, you identify a host to which the device is connected and a raw device name mkdve which it is accessed. The default is off. Suppresses the command output messages from standard output and standard error. See “Semantics for Syntax 1” for identical options not listed here.

Contains the mkdev command. Refer to “se-range” for a description of the se-range placeholder.

The following listing shows a few devices mmkdev they appear on a typical system. The script just shown creates four devices because four is the default in the scull sources. Not all devices support this feature.

To be usable by Oracle Secure Backup, each device must have at least one attachment, which describes a data path between a host and the device itself. Stay ahead with the world’s most comprehensive technology and business learning platform. Specifies the error rate percentage. Oracle Secure Backup issues a warning if it encounters a SCSI error when trying to read or reset the error counters of the drive.


Refer to “aspec” for a description of the aspec placeholder. If you encounter difficulties, however, particularly timeouts waiting for offline while unloading a drive, set the value to no.

Linux Device Drivers, Second Edition by Alessandro Rubini, Jonathan Corbet

Dynamic Allocation of Major Numbers. Defines the device in the Customized Devices object class. This flag cannot be used with the -S flag.

As an alternative to using a pair of scripts for loading and unloading, you could write an init script, ready to be placed in the directory your distribution uses for these scripts. If this file system is used, management of device files is simplified and quite different; on the other hand, the new filesystem brings several user-visible incompatibilities, and as we are writing it has not yet been chosen as ddevice default feature by system distributors.

Specifies the device class. If you specify the -R flag, the mkdev command configures any previously-defined parents of the specified device that are not already configured.

Major and Minor Numbers – Linux Device Drivers, Second Edition [Book]

By default, Oracle Secure Backup allows all tapes in a library to be accessed by all drives in the library. If you are only loading and unloading a single driver, you can just use rmmod and insmod after the first time you create the special files with your script: For private drivers, we strongly suggest that you use dynamic allocation to obtain your major device number, rather than choosing a number randomly from the ones that are currently free.


Thus, while much of the groundwork has been laid for larger device numbers, they are still treated as bit integers for now.

Specifies the query frequency in terms of kbwhich is the “distance” between samplings of the tape position expressed in 1KB blocks. Oracle Secure Backup issues a warning if the error rate reported by the device exceeds the value you specify. The command to create a device node on a filesystem is mknod ; superuser privileges are required for this operation.

The last few lines of the script may seem obscure: To avoid these warnings, disable error rate checking by specifying none for the error rate. You must have the modify administrative domain’s configuration right to use the mkdev command. For example, you may want the tapes in the first half of the storage elements to be available to the first drive and those in the second half to be available to the second drive.