Re: mirrored root disk boot block
From: Rob Stampfli (restamp_at_hotmail.com)
Date: 07/27/03
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Date: Sun, 27 Jul 2003 20:25:59 GMT
In article <3e949365.0307270836.71229256@posting.google.com>,
Bridge <bridge_xue@yahoo.com> wrote:
>After mirroring a root disk, does it still need to install the boot
>block on the mirrored disk?
>There are some documentations mentioned step of installing boot
>blocks, are they correct? As resync from the root disk to the mirrored
>disk should have a copy of the boot block, is that right?
I asked this same question a few months back, and the answer appears
to be "no" (unnecessary) for Sparc architectures (presuming, of
course, that an installboot was previously run on the underlying FS
being mirrored) and "yes" for Intels. Of course, it shouldn't hurt
anything to run an installboot on the mirrored partition after the
fact.
On the Sparcs, installboot causes the boot loader to be copied to
consecutive sectors starting at sector 1 on the applicable media.
This is in an area of the slice that the UFS FS doesn't use, but
that Disksuite still manages. Thus, the loader is copied over
automatically when the new mirror is synced. (As an aside,
Disksuite does not manage physical block 0 of the disk, as this
contains the disk's VTOC which would not necessarily be identical
between disks and which would most definitely cause problems if
overwritten incorrectly. But, neither the UFS FS nor the boot
loader concern themselves with block 0.)
The Intels boot in a different way, and it is necessary to run
an installboot after the fact, as noted in the manual.
Rob
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