The default is 8. Major and Minor Numbers. For libraries containing multiple drives in which more than one drive performs backups concurrently, you may want to partition the use of the tapes. Start Free Trial No credit card required. This flag cannot be used with the -l flag unless the -c , -s , and -t flags are also used. Minor numbers should be in the range 0 to because, for historical reasons, they are sometimes stored in a single byte.

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You must specify a dte number if –library is specified.

If you do not use the -l flag, a name will be automatically generated and mjdev. 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 a default feature by system distributors.

Char devices are accessed through names in the filesystem.

The arguments are the major number being released and mkev name of the associated device. When devfs is not being used, adding a new mldev to the system means assigning a major number to it. If you encounter difficulties, however, particularly timeouts waiting for offline while unloading a drive, set the value to no.

The largest value permitted for the maximum blocking factor, which is the number of byte records for each physical tape block, is Their major numbers are 1, 4, 7, and 10, while the minors are 1, 3, 5, 64, 65, and Defines the device in the Customized Devices object class. During a backup, Oracle Secure Backup periodically samples the position of the tape. There is tremendous pressure from the developer community to increase the number of possible devices supported by the kernel; increasing device numbers to at least 16 bits is a stated goal for the 2.


Refer to “aspec” for a description of the aspec placeholder. By default, Oracle Secure Backup allows all tapes in a library to be accessed by all drives in the library. The duration is the interval of time a drive is used before a cleaning cycle begins. The default value of yes specifies the emptiest cleaning tape, which causes cleaning tapes to round robin as cleanings are required.

This command can perform privileged operations.

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

Not all devices support user-supplied names. Use the mkdev command to configure a device for use with Oracle Secure Backup.

The default is off. Thus, while much of the groundwork has been laid for larger device numbers, they are still treated as bit integers for now. This flag cannot be used with the -S flag. The dte option is not available for standalone tape drives. This mmkdev assigns Oracle Secure Backup names and attributes to the devices in your administrative domain.


Typically, Oracle Secure Backup does not discriminate between tapes with readable barcodes and those without. A cleaning cycle is initiated devicce when a drive reports that it needs cleaning or when a specified usage time has elapsed.

makedev(3) – Linux manual page

The major and minor numbers are paired in a single data type that the driver uses to identify a particular device. The major number returned is always positive, while negative return values are error codes. The command to create a device node mkeev a filesystem is mknod ; superuser privileges are required for this operation.

Avoiding lengthy scripts revice useful during development. Normally, a device node requires a different access policy, so in some way or another access rights must be changed.

Проект OpenNet: MAN MKDEV (9) Ядро (FreeBSD и Linux)

A query frequency of 0 disables position sampling. Stopping this command before it is complete could result in a corrupted database. Specifies whether a barcode reader is present. You must have the modify administrative domain’s configuration right to mmkdev the mkdev command. The command takes three arguments in addition to the name of the file being created.