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Top Forums UNIX for Dummies Questions & Answers Unix System Total Replication Post 2198 by claudio on Friday 27th of April 2001 10:26:41 AM
Old 04-27-2001
Network Attempted Mirroring with dd: failed

Dear Neo & Nuraman,

we had the same problem and wanted to mirror our boot disk
to a backup one. So we tried to use dd as suggested by Neo.
Our boot disk is partitioned in eight... partitions.
Our backup disk is exactly the same as the boot one (same
model, size) and has been partitioned in the same way as the boot one.
So we tried to dd each partition on the boot disk to the
corresponding partition on the backup

Example: dd if=/dev/dsk/c0t0d0s0 of=/dev/dsk/c0t2d0s0

At the end, we took a look at the backup disk: it was
empty, no file which was on the boot disk was found on the
backup.
We even tried to swap disks, but the server does not boot
anymore, a message is shown saying: Boot failed, loaded
file is not executable.

Did we dd'ed the correct devices ?
On our system there are the same partitions listed as
/dev/rdsk/c0t...
May be we must dd those devices instead ?
 

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installgrub(1M) 														   installgrub(1M)

NAME
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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