Major and Minor Numbers. With Safari, you learn the way you learn best. Char devices are accessed through names in the filesystem. The reason is that the script must be run by the superuser, so newly created special files are owned by root. Please note that once created by mknod , the special device file remains unless it is explicitly deleted, like any information stored on disk. The largest value permitted for the maximum blocking factor, which is the number of byte records for each physical tape block, is

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mkdev Command

Note that you can execute the clean command to clean a drive manually. By default, Oracle Secure Backup writes 64K blocks to tape, which is a blocking factor of Their major numbers are 1, 4, 7, and 10, while the minors are 1, 3, 5, 64, 65, and Oracle Secure Backup checks for cleaning requirements when a cartridge is either loaded into or unloaded from a drive.

Specifies the device class.

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: Prevents the device from being set to the Available state.

Oracle Secure Backup issues a warning if the error rate reported by the device exceeds the value you specify. While Oracle Secure Backup has attempted to determine ,kdev query frequencies for all supported drive types, you may find that you need to adjust the query frequency. Removing a Driver from the System. This flag is only meaningful for those devices that support the Stopped state.


Linux World: The working of macros MAJOR,MINOR and MKDEV

Oracle Secure Backup issues a warning if it revice a SCSI error when trying to read or reset the error counters of the drive. Please note the behavior is devics different in the two cases: The maximum blocking factor controls the amount of data that Oracle Secure Backup initially reads from a tape whose blocking factor mkdv unknown.

This value represents a maximum tape block size of 2MB. Defines and makes available a device with the given device class -c Class flagtype -t Type flagsubclass -s Subclass flagconnection location -w ConnectionLocation flagand the device logical name of the parent -p ParentName flag Makes available the previously defined device specified by the given device logical name -l Name flag.

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

In the attachment, you identify a host to which the device is connected and a raw device name through which it is accessed. Use the mkdev command to configure a device for use with Oracle Secure Backup. The code we suggest using is similar to the code introduced for autodetection of port numbers.

You should disable any system software that scans and opens arbitrary SCSI targets before configuring Oracle Secure Backup tape devices. With Safari, you learn the way you learn best. Refer to “se-range” for a description of the se-range placeholder.


Stay ahead with the world’s most comprehensive technology and business learning platform. The return value indicates success or failure of the operation.

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.

You must have the modify administrative domain’s configuration right to use the mkdev command. When a module is unloaded from the system, the major number must be released. Specifies whether automatic tape cleaning should be enabled.

A setting of no can be useful if you dedicate a tape drive to performing on-demand restore operations, but not backups. Only privileged users can run privileged operations.

Specifies a maximum blocking factor. The script can be adapted for another driver by redefining the variables and adjusting the mknod lines. For example, –usage 1month requests a cleaning cycle every month. This data type is designed to be a black box for every kernel function. Suppresses the command output messages from standard output and standard error.

During a backup, Oracle Secure Backup periodically samples the position of the tape. By default, Oracle Secure Backup allows all tapes in a library to be accessed by all drives in the library.