LILO Boot Sector Question

I have a RAID 1 mirror set and had to replace drive hdb with a new drive.
That worked okay. I even got linux to sync all the data to the new drive.
However, it didn't copy the boot sector to the second drive. Anyone know
how to do that?

I am running RH 9.0 software RAID 1 and LILO as the boot loader. Thanks for
any help.


Lamar

In comp.os.linux.networking Lamar Thomas <(E-Mail Removed)> wrote:
> I have a RAID 1 mirror set and had to replace drive hdb with a new drive.
> That worked okay. I even got linux to sync all the data to the new drive.
> However, it didn't copy the boot sector to the second drive. Anyone know
> how to do that?

man cp.

But why would you want the mbr of one drive on the other drive? Surely
it wouldn't point to the right place! The physical offset of the kernel
image would be all wrong for the other drive, likely as not.

Just run lilo again, with root drive set to what the drive will be when
the other has failed. Hic.



Peter

(E-Mail Removed) (P.T. Breuer) writes:

> In comp.os.linux.networking Lamar Thomas <(E-Mail Removed)> wrote:
> > I have a RAID 1 mirror set and had to replace drive hdb with a new drive.
> > That worked okay. I even got linux to sync all the data to the new drive.
> > However, it didn't copy the boot sector to the second drive. Anyone know
> > how to do that?
>
> man cp.
>
> But why would you want the mbr of one drive on the other drive? Surely
> it wouldn't point to the right place! The physical offset of the kernel
> image would be all wrong for the other drive, likely as not.

I thought RAID 1 maintained a sector-for-sector exact mirror?
--
Joseph J. Pfeiffer, Jr., Ph.D. Phone -- (505) 646-1605
Department of Computer Science FAX -- (505) 646-1002
New Mexico State University http://www.cs.nmsu.edu/~pfeiffer
Southwestern NM Regional Science and Engr Fair: http://www.nmsu.edu/~scifair

In comp.os.linux.networking Joe Pfeiffer <(E-Mail Removed)> wrote:
> (E-Mail Removed) (P.T. Breuer) writes:

> > In comp.os.linux.networking Lamar Thomas <(E-Mail Removed)> wrote:
> > > I have a RAID 1 mirror set and had to replace drive hdb with a new drive.
> > > That worked okay. I even got linux to sync all the data to the new drive.
> > > However, it didn't copy the boot sector to the second drive. Anyone know
> > > how to do that?
> >
> > man cp.
> >
> > But why would you want the mbr of one drive on the other drive? Surely
> > it wouldn't point to the right place! The physical offset of the kernel
> > image would be all wrong for the other drive, likely as not.

> I thought RAID 1 maintained a sector-for-sector exact mirror?

Well, ya know, you have a point. But the partition itself may not be in
exactly the same place!

Peter

On Wed, 31 Dec 2003 22:51:20 GMT, "Lamar Thomas" <(E-Mail Removed)> wrote:

>I have a RAID 1 mirror set and had to replace drive hdb with a new drive.
>That worked okay. I even got linux to sync all the data to the new drive.
>However, it didn't copy the boot sector to the second drive. Anyone know
>how to do that?
>
>I am running RH 9.0 software RAID 1 and LILO as the boot loader. Thanks for
>any help.

With software RAID1 & the out-of-date LILO that RH distributes, the boot
sector is on the MBR, not the RAID partition. In reconstructing the mirror,
only the RAID1 partition was duplicated. RAID1 codes know nothing about boot
loaders.

Just re-run /sbin/lilo to install a new boot sector on the new drive.

--John