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NAMEzfsboot —
bootcode for ZFS on BIOS-based computers
DESCRIPTIONzfsboot 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 specification 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).
BOOTINGThezfsboot 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.
USAGEzfsboot supports all the same prompt and configuration
file arguments as
gptzfsboot(8).
FILES
EXAMPLESzfsboot 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
gpart create -s mbr ada0 gpart add -t freebsd ada0 gpart bootcode -b /boot/boot0 ada0 gpart set -a active -i 1 ada0 dd if=/dev/zero of=/dev/ada0s1 count=2 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 ALSOdd(1), boot.config(5), boot(8), gptzfsboot(8), loader(8), zpool(8)HISTORYzfsboot appeared in FreeBSD 7.3.
AUTHORSThis manual page was written by Andriy Gapon ⟨avg@FreeBSD.org⟩.BUGSInstallingzfsboot with
dd(1) is a
hack. ZFS needs a command to properly install zfsboot
onto a ZFS-controlled disk or partition.
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