Re: How to kill your VxVM boot ;-)

On Mar 21, 3:39 am, Ulrich Windl <Ulrich.Wi...@xxxxxxxxxxxxxxxxxxxx>
wrote:
Hi,

I never liked the complexity of VxVM and the absence of text terminal
configuration (in SAM). However I had made an interesting (fatal however)
experiment:

A VxVM disk group consisting of two 18 GB disks is used for everything (also
booting). While the system was running, I did "dd" both disks to two different
disks (as a kind of backup). After some time I rebooted. Guess what?

The system is unable to boot any more, because the system complains about
"Unable to resolve duplicate diskid".

An new over-quorum feature: If there are more disks that the system knows
about, it stops to work. A good chance for a denial of service.

Long live LVM!

Regards,
Ulrich

My first, and thankfully ONLY exposure to this product was actually
under Digital UNIX. If my memory serves me, it was called LSM
(Logical Storage Manager) under that platform. I absolutely hated
it. We had it on a couple of Digital UNIX systems and as I became
more and more familiar with Digital UNIX, I removed it from any system
we had it installed on.

When I saw they were including the base VxVM component on HP-UX, all I
could say it "you're kidding". LVM is such a superior product (IMO).

Charles R. Whealton
Charles Whealton @ pleasedontspam.com

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