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System Administration Guide: Basic Administration

Description of the Solaris Boot Archives

When you install the Solaris OS on a system, the bootadm command creates one primary boot archive and one failsafe archive.

A primary boot archive is a subset of a root (/) file system. This boot archive contains all of the kernel modules, driver.conf files, in addition to a few configuration files. These files are located in the /etc directory. The files in the boot archive are read by the kernel before the root (/) file system is mounted. After the root (/) file system is mounted, the boot archive is discarded by the kernel from memory. Then, file I/O is performed against the root device.

Note –

If you are running a Solaris Express release on an x86 based system, two primary boot archives (one 32-bit archive and one 64-bit archive) are created at installation time. The 32-bit archive is located in /platform/i86pc/boot_archive. The 64-bit archive is located in /platform/i86pc/amd64/boot_archive.

The files that make up the SPARC boot archives are located in the /platform directory.

The contents of this directory are divided into three groups of files:

The files that make up the x86 boot archives are located in the /platform/i86pc directory.

If you are running the Solaris Express release, the contents of this directory are divided into two groups of files:

To list the files and directories that are included in the boot archives, use the bootadm list-archive command.

If any files in the archive are updated, the boot archive must be rebuilt. For modifications to take effect, the rebuild of the archive must take place before the next system reboot

The failsafe boot archive is the second type of archive that is created when you install the Solaris OS.

A failsafe boot archive has the following benefits and characteristics:

For more information about booting a system in failsafe mode, see Booting the Failsafe Archive on a SPARC Based System and Booting the Failsafe Archive on an x86 Based System.