Saves information about base-customized devices in the Device Configuration database onto the boot device.
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. The savebase command is typically run without any parameters. It uses the /dev/ipl_blv special file link to identify the output destination.
Alternatively, use the -d flag to specify a destination file or a device, such as the /dev/hdisk0 device file. To identify a specific output destination, the -d flag identifies the file to which savebase writes the base customized device data. This file can be either a regular file or a device special file. The device special file identifies either a disk device special file or a boot logical volume device special file.
A disk device special file can be used where there is only one boot logical volume on the disk. The savebase command ensures that the given disk has only one boot logical volume present and is bootable. If neither of these conditions is true, savebase does not save the base customized device data to the disk and exits with an error.
When a second boot logical volume is on a disk, the boot logical volume device special file must be used as the destination device to identify which boot image the base customized device data will be stored in. A boot logical volume device special file can be used even if there is only one boot logical volume on the disk. The savebase command ensures that the given device special file is a boot logical volume and it is bootable before saving any data to it. If either of these checks fails, savebase exits with an error.
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.
Item | Description |
---|---|
-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 output. |
savebase -v
savebase -o /tmp/objrepos
savebase -d /dev/hdisk0
Item | Description |
---|---|
/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. |