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Date:	Mon, 9 Dec 2002 11:10:29 PST7
From:	"Steven Levine" <steve53@earthlink.net >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: LVM anxieties

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In <0H6T00L79YM0IG@mta5.snfc21.pbi.net>, on 12/08/02
at 06:23 PM, sshapiro@ucsd.edu (Sandy Shapiro) said:

>I am trying to learn more about LVM. Mostly I learn from trying things
>out and making mistakes, but this time, I didn't learn anything -- and
>that makes me anxious.

What you are really asking is how to get LVM and System Commander to
cooperate.

LVM writes additional control data to otherwise unused sectors of 1st
track of each partition. This records the LVM specific data.

SC rewrites the MBR as part of its processing. It knows nothing about LVM
data so it may or may not preserve it. I believe some folks are using SC
and LVM together without problems.

>System Commander lets me boot into each operating system. But I can only
>access eCs from System Commander by going first into Boot Manager. (If I
>try to boot directly into eCS I get an error message half way thru the
>boot process "Unable to operate your hard disk.")

This makes sense since BM tells the kernel which volume letter it is
booting from. SC does not do this. If the LVM volume letter and the
physical drive letter are the same, the boot should not fail.

>For some reason, even though System Commander will recognize Win 98 on
>the third hard drive, it won't boot. I can boot to Win 98, however, by
>going into system BIOS and forcing a boot to Drive E.

This is probably a BIOS limitation. Historically, BIOS's supported
booting only from the first two physical drives.

>But in the meantime, both partitions on the first drive got wiped out!
>When I looked with Partition Magic, drive one was one large partition,
>and Boot Manager had installed itself on the third drive making that
>drive no longer bootable -- even when changing the BIOS.

Interesting. I can't even guess what to blame for this.

>As Far As I Know I only made two changes in LVM:
>I created a new volume for the third hard drive.
>I changed the name of the new volume to Win 98.

Are you sure you just did not forget to create volumes fo the existing
partitions? Switch LVM to physical view and see if the partitions are
still there?

Steven

--
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"Steven Levine" MR2/ICE 2.35 #10183 Warp4/FP15/14.085_W4
www.scoug.com irc.webbnet.org #scoug (Wed 7pm PST)
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