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Commands Reference, Volume 5

savebase Command


Saves information about base-customized devices in the Device Configuration database onto the boot device.


savebase [ -o Path ] [ -d File ] [ -v ]


The savebase command stores customized information for base devices for use during phase 1 of system boot. By default, the savebase command retrieves this information from the /etc/objrepos directory. However, you can override this action by using the -o flag to specify an ODM directory. By default, the savebase command writes the information it retrieves to the boot disk. Alternatively, you can use the -d flag to specify a destination file or a device, such as the /dev/hdisk0 device file.

The savebase command determines what device information to save using the PdDv.base field corresponding to each entry in the CuDv object class. Specifically, the PdDv.base field is a bit mask which represents the type of boot for which this device is a base device. The savebase command determines the current type of boot by accessing the boot_mask attribute in the CuAt object class. The value of this attribute is the bit mask to apply to the PdDv.base field to determine which devices are base.

Note: Base devices are those devices that get configured during phase 1 boot; they may vary depending on the type of boot (mask). For example, if the mask is NETWORK_BOOT, network devices are considered base; for DISK_BOOT, disk devices are considered base. The type-of-boot masks are defined in the /usr/include/sys/cfgdb.h file.


-d File Specifies the destination file or device to which the base information will be written.
-o Path Specifies a directory containing the Device Configuration database.
-v Causes verbose output to be written to standard input.


  1. To save the base customized information and see verbose output, enter:

    savebase -v
  2. To specify an ODM directory other than the /usr/lib/objrepos directory, enter:

    savebase -o /tmp/objrepos
  3. To save the base customized information to the /dev/hdisk0 device file instead of to the boot disk, enter:

    savebase -d /dev/hdisk0


/usr/include/sys/cfgdb.h Defines the type of boot mask for base devices.
/usr/lib/objrepos/PdDv Contains entries for all known device types supported by the system.
/etc/objrepos/CuDv Contains entries for all device instances defined in the system.
/etc/objrepos/CuAt Contains customized device-specific attribute information.
/etc/objrepos/CuDep Describes device instances that depend on other device instances.
/etc/objrepos/CuDvDr Stores information about critical resources that need concurrency management through the use of the Device Configuration Library routines.

Related Information

The bosboot command, restbase command.

Object Data Manager (ODM) Overview for Programmers in AIX 5L Version 5.2 General Programming Concepts: Writing and Debugging Programs.

Device Configuration Subsystem: Programming Introduction, List of Device Configuration Commands in AIX 5L Version 5.2 Kernel Extensions and Device Support Programming Concepts.

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