dd disk image won't boot

[/dev/null]

Hello,

I have the following problem :

I took a dd image from a boot disk on a E4500 to another disk on a
second diskboard.
disk0 (source) = /dev/dsk/c0t10d0s2
disk3 (target) = /dev/dsk/c1t14d0s2

The goal was to have a copy of the boot disk. (I know there are better
and faster ways of copying disk, but this is the way it is). As dd takes
a bitwise copy, I expect the resulting disk to be bootable. So, I issued
the following command (in single user mode) :

dd if=/dev/rdsk/c0t10d0s2 of=/dev/rdsk/c1t14d0s2 bs=1048576

When I swap the diskboards, the kernel spits out the following error
message :
Device not bootable

I booted from cdrom, mounted the disk, and verified the contents of it.
Looked Ok. Then I made sure the disk to be bootable by a "installboot"
command. When I rebooted with "boot disk" on the Ok prompt, I got the
same error (Device not bootable).

I'm really puzzled here. Could it be that I have to dd the last slice
too ? Maybe the blocksize is too big, and a part of the last slice
didn't get copied ?

The disk I dd'ed was mirrorred too. Could this be a problem ? But I
expect that the copied disk only will complain about it mirror not up to
date (metastat will issue a Needs maintenance), so that after a
"metareplace -e c1t15d0s2" (second disk on the new diskboard), the
mirror resyncs itself.

DN.

[Darren Dunham]

/dev/null <foo@unix.org> wrote:

> Hello,

> I have the following problem :

> I took a dd image from a boot disk on a E4500 to another disk on a
> second diskboard.
> disk0 (source) = /dev/dsk/c0t10d0s2
> disk3 (target) = /dev/dsk/c1t14d0s2

> The goal was to have a copy of the boot disk. (I know there are better
> and faster ways of copying disk, but this is the way it is). As dd takes
> a bitwise copy, I expect the resulting disk to be bootable.

Correct.

> When I swap the diskboards, the kernel spits out the following error
> message :
> Device not bootable

The "kernel" does? Huh?

I've never seen "Device not bootable" from the kernel or from an OBP
message. Instead I'd expect "No such device", "can't open device", or
"contents don't appear to be bootable".

Can you cut & paste the entire contents from "boot disk" to the error
message?

I can only assume that you're not booting from the disk you think you
are.

--
Darren Dunham [email]ddunham@taos.com[/email]
Unix System Administrator Taos - The SysAdmin Company
Got some Dr Pepper? San Francisco, CA bay area
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