From: Corne Beerse (cbeerse@gmail.com)
Date: Mon Feb 25 2008 - 03:44:42 EST
Yoho, Cindy wrote:
> I am trying to do something that HP says I can't do :-) and I just
> want to confirm that they are right. I have my system disk mirrored,
> and I want to know if I can break the mirror in such a way that I can
> still boot off either disk. HP says the only way to do that is to
> physically pull the alternate disk out of the enclosure, then push it
> back in if I want to boot from it. This seems crazy to me. I am
> about to boot from an ignite tape and resize all of the primary disk's
> logical volumes, which then requires loading everything from the tape
> to get it back in working order. If this tape doesn't load correctly
> I want to be able to boot off the mirror and get back to square one.
> Surely there is a way to do this? HP claims when you load an ignite
> tape it marks the mirror as unbootable, because it's no longer like
> the primary. I suggested breaking the mirror prior to making the
> ignite tape, so the info on the tape doesn't know about the copy, but
> they say lvreduce will do the same thing, making the alternate disk
> unbootable. Anyone ever do this?
My first thoughts where "Never say you can't to those who do". However,
you are not doing it, you just tell you will do it. As far as I read it,
you will break the mirror, change the mirror information and then return
to the mirror. That will only succeed if the mirror information is on
the mirror and somehow this mirror information prevails above all other
mirror configuration. I (and my experience) say that will not be
successfull.
The only way you might have a change in a successfull return to the old
mirror is that the raid has absolutely no configuration or exactly the
old configuration and the configuration on disk is accepted as primary,
even where the configuration in the raid is most likely newer.
Mean while, configuring the new raid, you will need to have all disks in
place, to get the configuration to success.
In the end, my question is whay do you not trust your backup?
So I'd say HP is right, donnot expect to be able to return to the broken
mirror after changing the raid configuration.
CBee
--
---> Please post QUESTIONS and SUMMARIES only!! <---
To subscribe/unsubscribe to this list, contact majordomo@dutchworks.nl
Name: hpux-admin@dutchworks.nl Owner: owner-hpux-admin@dutchworks.nl
Archives: ftp.dutchworks.nl:/pub/digests/hpux-admin (FTP, browse only)
http://www.dutchworks.nl/htbin/hpsysadmin (Web, browse & search)
This archive was generated by hypermail 2.1.7 : Sat Apr 12 2008 - 11:02:59 EDT