9 More Discussions You Might Find Interesting
1. Solaris
I understand the OBP program looks for the boot-device, loads the bootblk (located on physical disk sectors 1 through 15). Then the secondary boot program, /platform/`arch -k`/ufsboot is run. This program loads the kernel core image files (genunix and unix).
So how does it uses the ufsboot and... (1 Reply)
Discussion started by: MR.bean
1 Replies
2. Red Hat
Hello,
Sometime i see that the boot process hangs.
I am using rhel 6.2.
At that time in the console i see
Probing EDD (edd=off to disable)...
SSH service seems to be started but i can't login...
ssh logs (last lines) in verbose mode level 3:
debug2: we did not send a packet,... (3 Replies)
Discussion started by: @dagio
3 Replies
3. UNIX for Advanced & Expert Users
Hey guys,
I am working on a security module which checks signatures of binarys/shared libs. The Linux security framework (and thus my module) gets loaded early in the bootprocess.
Right now all my module does is - whenever a binary gets mmap'ed for execution - print out a message using printk()... (1 Reply)
Discussion started by: disaster
1 Replies
4. Red Hat
Hi Folks,
Initially I had vista and redhat 9 .. due to some reasons i had to re instal my vista again.. since then the dual boot menu disappeared.. i tried to re install redhat and changing the boot configuration of redhat 9 but i am not getting both the OS back .. I am not aboe to boot linux... (2 Replies)
Discussion started by: subhotech
2 Replies
5. Filesystems, Disks and Memory
I have 40GB HD with mepis8, swap, MBR and under flags word boot.
I also have a 160 GB external with a few Linux OS, no swaps, no extended etc. I am total Linux no MS
I would feel more secure by resizing that sda1 partition and creating a /boot partition with the MBR housed there. Is that a... (1 Reply)
Discussion started by: worthamtx
1 Replies
6. Programming
what would happen if a process wrote to its own stdin?
#include<unistd.h>
#include<fcntl.h>
int main()
{
if((write(STDIN_FILENO,"arrgh!",6))==-1)
{
perror("error writing to file");
}
}
output:
$ gcc temp.c
$ ./a.out
arrgh!$ (9 Replies)
Discussion started by: c_d
9 Replies
7. UNIX for Dummies Questions & Answers
Hi all,
I am newbie here.I want to know what is MBR,boot loader & boot strap programe.
What is procedure of loading OS in to memory.
Thanx in advance:) (1 Reply)
Discussion started by: vishwasrao
1 Replies
8. UNIX for Advanced & Expert Users
I have an unix id (AIX system) which is used to run a couple of processes. They also write some log files into a file system (that is not in the home directory of the user id, but in different location).
One bad day, the id was deleted accidentally. But the home directory, files and everything... (1 Reply)
Discussion started by: cmgreat
1 Replies
9. Red Hat
Hi ,
I have two disk installed with Linux(disk 1) and WinXP(disk 2) .Now i am changing Hardisk jumbper manualy to get in to Linux/Windows .I want to configure my REDHAT linux boot manager to list Linux and WindowXP and wanna boot according to my choice .
Here is what my fdisk -l shows (Only... (2 Replies)
Discussion started by: gkrishn
2 Replies
ZFSBOOT(8) BSD System Manager's Manual ZFSBOOT(8)
NAME
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 <avg@FreeBSD.org>.
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
