[ubuntu-us-nc] hey from Carolina Beach

Jim Rorie JimRorie at logisys.biz
Wed Apr 16 17:16:28 BST 2008

A rebuild on a 160GB shouldn't take more than 12 hours. I'd expect a 320GB
should exceed a day.  I haven't run into too many situations where a rebuild
fails, unless the media was damaged or the raid was confused.  This is
assuming that you didn't do anything to de-synch the raid.  If the raid was
working before and became degraded, I would look long and hard at the disk.
Does SMART report anything?  (Not that I think highly of SMART, but it is a
tool none the less)   Another possibility is that there is insufficient
space on the secondary drive.  Loss of sectors to the extent that the mirror
drive is physically smaller can confuse some systems.  Although, I would
expect an error to be thrown.


From: Mark Kempster [mailto:mark at kempster.org] 
Sent: Tuesday, April 15, 2008 10:54 PM
To: jimrorie at logisys.biz
Cc: ubuntu-us-nc at lists.ubuntu.com
Subject: Re: [ubuntu-us-nc] hey from Carolina Beach

Without diverging too much from the original thread, yeah - 2 sata disks,
software raid and lvm. My goal was to do raid-1 and be able to pop out a
disk, put it in the safe for backup, pop in a new one and have the raid
reconstruct itself. Add raid pairs (hence the lvm bit) as needed.

I tried plugging in 2 320GB sata drives. I noticed one had gone south (mdadm
was reporting a 'degraded' raid) and asked mdadm to reinitialize the
degraded disk. It did, seemed to pull it back into the raid and all was
happy. About a week later I got up to ~170GB (curious that it's near half of
320) and the disk was being reported as full.

I'm fairly certain I'm the cause of the problem, but I'm pretty new to
setting up raid and didn't really dive too far into the guts to find the
problem. I just finished deploying 8.04 beta to another machine with the
intent of moving all the bits from machine a (the one with the raid) to
machine b, nuke machine a and deploy 8.04, create the raid (hopefully
correctly this time), test the size stuff, and then move the vmware bits
from machine b back to a. So, I'll have a playground box that'll be fully
reloadable for the duration of this raid and vmware-vs-kvm comparison.

If others are interested in this topic, either as the topic for an irc
meeting or two, or for some more hands-on and/or group experimentation, I'm
willing to share the meager resources of this little box if it'll serve for
illustration or something along those lines.

- Mark

On Tue, Apr 15, 2008 at 10:25 PM, Jim Rorie <jimrorie at logisys.biz> wrote:

Nope, you're right on target for this list.

I think there is a lot of interest in this subject.  I am looking to set
up an Ubuntu host with a Windows MCE guest to aid my migration from MCE
to Ubuntu.  I also would like to run a XP guest on my laptop for those
apps that Wine is choking on (My harmony remote, for one). I will be
diving in once Hardy is out.

Is your sata-raid software only?  I have some experience with the nvidia
hardware raids if that might help.


On Tue, 2008-04-15 at 21:44 -0400, Mark Kempster wrote:
I'm new to the irc meetup thing, so apologies if this is way out in the

I'm interested in virtualization. I really ran into trouble with running
vmware-server and getting knocked around a bit when ubuntu had kernel
updates. It sure was a rude awakening to have my vmware collection of
servers all go belly up after what had previously (in a
pre-vmware-server) been a pretty innocent change. Yeah, kernel upgrades
can be scary, but it was a pretty rocky couple months with ubuntu and
vmware there for awhile. I hope kvm is better.

With the shipping of kvm in Hardy, I'm really interested in using ubuntu
as the host o/s, ubuntu JeOS as the guests with kvm as the
virtualization stack. Problem is, I really don't know jack about kvm.

Along those lines, I'm interested in storing these multiple kvm guests
on a raid 1 or something. I attempted something similar in Gutsy and
kinda blew it. A lesson in sata-raid1-setup would do me wonders.

So, with the maturing of Ubuntu in general (just installed the beta
today) and specifically the inclusion of kvm, I'm interested if others
have experience running ubuntu as both host and guest. If folks would be
willing to share some of their practical knowledge, or if other folks
who are interested but (like me) have only a little bit of experience
have questions and are interested in a group foray into the experiment,
I'd be interested in joining in.

- Mark

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