[linux-lvm] Configuring boot partition with LVM (fwd)
shaulis at tkg.com
Wed Feb 9 21:47:25 UTC 2000
As of AIX 4.3.3, you can't boot off of a striped logical volume,
although you can have your boot partition mirrored on multiple physical
volumes. All of the physical volumes with a copy of the boot lv must be
in the boot list. Thats new as of AIX 4.2.0, although you need a couple
APARs to have it work right at that version.
I can't remember exactly how they explained it, but IBM has a good
reason for not allowing mirrored dump devices. I think the idea is that
in order to catch the system dumping in the LVM code itself, you have to
write the dump without the aid of the LVM. I think the way that works is
that it precomputes a list of offset:extent lists for the device when it
is brought online. If anyone really wants to know what goes on behind
the scenes let me know -- I've got a couple colleagues that do AIX
kernel development at IBM. You are allowed to have a secondary dump
device but that only gets used if writing to the first device fails.
From: Jens-Uwe Mager <jum at anubis.han.de>
> At least the IBM people with the AIX LVM are able to make that
> work. The only thing that they were not able for a long time is to
> make system dumps work in such a configuration. But I believe that
> even that works under AIX 4.3.x now.
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