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zfsboot(8) [freebsd man page]

ZFSBOOT(8)						    BSD System Manager's Manual 						ZFSBOOT(8)

zfsboot -- bootcode for ZFS on BIOS-based computers DESCRIPTION
zfsboot is used on BIOS-based computers to boot from a filesystem in a ZFS pool. zfsboot is installed in two parts on a disk or a partition used by a ZFS pool. The first part, a single-sector starter boot block, is installed at the beginning of the disk or partition. The second part, a main boot block, is installed at a special offset within the disk or partition. Both areas are reserved by the ZFS on-disk specifi- cation for boot use. If zfsboot is installed in a partition, then that partition should be made bootable using appropriate configuration and boot blocks described in boot(8). BOOTING
The zfsboot boot process is very similar to that of gptzfsboot(8). One significant difference is that zfsboot does not currently support the GPT partitioning scheme. Thus only whole disks and MBR partitions, traditionally referred to as slices, are probed for ZFS disk labels. See the BUGS section in gptzfsboot(8) for some limitations of the MBR scheme support. USAGE
zfsboot supports all the same prompt and configuration file arguments as gptzfsboot(8). FILES
/boot/zfsboot boot code binary /boot.config parameters for the boot block (optional) /boot/config alternative parameters for the boot block (optional) EXAMPLES
zfsboot is typically installed using dd(1). To install zfsboot on the ada0 drive: dd if=/boot/zfsboot of=/dev/ada0 count=1 dd if=/boot/zfsboot of=/dev/ada0 iseek=1 oseek=1024 If the drive is currently in use, the GEOM safety will prevent writes and must be disabled before running the above commands: sysctl kern.geom.debugflags=0x10 zfsboot can also be installed in an MBR slice: gpart create -s mbr ada0 gpart add -t freebsd ada0 gpart create -s BSD ada0s1 gpart bootcode -b /boot/boot0 ada0 gpart set -a active -i 1 ada0 dd if=/boot/zfsboot of=/dev/ada0s1 count=1 dd if=/boot/zfsboot of=/dev/ada0s1 iseek=1 oseek=1024 Note that commands to create and populate a pool are not shown in the example above. SEE ALSO
dd(1), boot.config(5), boot(8), gptzfsboot(8), loader(8), zfsloader(8), zpool(8) HISTORY
zfsboot appeared in FreeBSD 7.3. AUTHORS
This manual page was written by Andriy Gapon <>. BUGS
Installing zfsboot with dd(1) is a hack. ZFS needs a command to properly install zfsboot onto a ZFS-controlled disk or partition. BSD
September 15, 2014 BSD

Check Out this Related Man Page

installgrub(1M)                                                                                                                    installgrub(1M)

installgrub - install GRUB in a disk partition or a floppy SYNOPSIS
/sbin/installgrub [-fm] stage1 stage2 raw-device The installgrub command is an -only program. GRUB stands for GRand Unified Bootloader. installgrub installs GRUB stage 1 and stage 2 files on the boot area of a disk partition. If you specify the -m option, installgrub installs the stage 1 file on the master boot sector of the disk. The installgrub command accepts the following options: -f Suppresses interaction when overwriting the master boot sector. -m Installs GRUB stage1 on the master boot sector interactively. The installgrub command accepts the following operands: stage1 The name of the GRUB stage 1 file. stage2 The name of the GRUB stage 2 file. raw-device The name of the device onto which GRUB code is to be installed. It must be a character device that is readable and writable. For disk devices, specify the slice where the GRUB menu file is located. (For Solaris it is the root slice.) For a floppy disk, it is /dev/rdiskette. Example 1: Installing GRUB on a Hard Disk Slice The following command installs GRUB on a system where the root slice is c0d0s0: example# /sbin/installgrub /boot/grub/stage1 /boot/grub/stage2 /dev/rdsk/c0d0s0 Example 2: Installing GRUB on a Floppy The following command installs GRUB on a formatted floppy: example# mount -F pcfs /dev/diskette /mnt # mkdir -p /mnt/boot/grub # cp /boot/grub/* /mnt/boot/grub # umount /mnt # cd /boot/grub # /sbin/installgrub stage1 stage2 /dev/rdiskette /boot/grub Directory where GRUB files reside. See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ boot(1M), fdisk(1M), fmthard(1M), kernel(1M), attributes(5) Installing GRUB on the master boot sector (-m option) overrides any boot manager currently installed on the machine. The system will always boot the GRUB in the Solaris partition regardless of which fdisk partition is active. 24 May 2005 installgrub(1M)

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