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From: onepeanutwhistle on 16 Apr 2008 03:07
It's really that I was wondering about the possibility of destroying a
great amount of effort I've put in my own system. And yes, stability
is highly prized. The idea of trying one little used partition has
won
my interest.

I have a much older system that I actually could try with Fedora 7
or Fedora 8 and let LVM have its way with partitions I hadn't put
so much work into. We also could wait another month or so for
RHEL 5.2 to come out of beta testing and see if that changes my
mind. At least system-config-lvm gives a bit of a gui. I suppose
it would be nice if an LVM wizard was in the works. Perhaps one
day, GParted will be able to work with LVM too.

Thank you kindly folks!
Onepeanutwhistle
From: Dave Sill on 16 Apr 2008 14:33
Mark Anderson <mea(a)nospambrandylion.com> writes:

> In article rebelATT(a)magmaDOTT.ca says...
>> LVM is powerful, but can really bite you quick if you
>> make a mistake.
>
> Many years ago during an install of FC4 I had lvm installed by default.
> Since my servers are only used by me I don't really need much
> sophistication with regards to disk partitioning. Since then I have had
> nothing but trouble with lvm and it adds a level of complexity I don't
> need. I would never config a disk with lvm ever. YMMV

My mileage is definitely better than yours. I use LVM on dozens of
RHEL 3/4/5 and Fedora 5/6/7/8 systems, and have never had a single
problem with it.

--
Dave Sill Author, The qmail Handbook
Oak Ridge National Lab, IT Services <http://lifewithqmail.org/>
From: noi ance on 16 Apr 2008 16:03
On Wed, 16 Apr 2008 00:07:01 -0700, onepeanutwhistle typed this message:

> It's really that I was wondering about the possibility of destroying a
> great amount of effort I've put in my own system. And yes, stability is
> highly prized. The idea of trying one little used partition has won
> my interest.
>
> I have a much older system that I actually could try with Fedora 7 or
> Fedora 8 and let LVM have its way with partitions I hadn't put so much
> work into. We also could wait another month or so for RHEL 5.2 to come
> out of beta testing and see if that changes my mind. At least
> system-config-lvm gives a bit of a gui. I suppose it would be nice if
> an LVM wizard was in the works. Perhaps one day, GParted will be able
> to work with LVM too.
>
> Thank you kindly folks!
> Onepeanutwhistle

LVM was a problem in FC4 but LVM has matured with better tools. I
suppose there's cautions regarding RAID drives and very large files.
Seems like extra overhead, but working the bugs out on a small test
system is the right approach, in case you crash an LVM volume or
something.

I don't use LVM because it interfered with Ext2ifs tool to seamlessly
access Linux files from Windows. Don't think Ext2ifs has caught up with
LVM yet.
From: Johnny Rebel on 16 Apr 2008 18:48
onepeanutwhistle(a)aol.com wrote:
> It's really that I was wondering about the possibility of destroying a
> great amount of effort I've put in my own system. And yes, stability
> is highly prized. The idea of trying one little used partition has
> won
> my interest.

If you are not really familiar with LVM's and how they work, the chances
of destroying data I would put at 100%. Stability is not an issue, but
typically you want to set it up on a new/fresh system.

>
> I have a much older system that I actually could try with Fedora 7
> or Fedora 8 and let LVM have its way with partitions I hadn't put
> so much work into. We also could wait another month or so for
> RHEL 5.2 to come out of beta testing and see if that changes my
> mind. At least system-config-lvm gives a bit of a gui. I suppose
> it would be nice if an LVM wizard was in the works. Perhaps one
> day, GParted will be able to work with LVM too.

That is the way to do it, get familiar with it and most of all, become
comfortable with it. Again, I wouldn't touch a production type system
for experimenting with LVM's... you would destroy data. I am a little
familiar with system-config-lvm, but never use it. The CLI provides
more data, faster, and keeps one layer of possible bugs out... The GUIs
for that kind of thing are typically the last thing tested... Sort of
like dump and restore - dump is tested through the waazoo, restore, not
so much. :)

JR.

>
> Thank you kindly folks!
> Onepeanutwhistle


--

Bill will have to take Linux from my cold, dead flippers.

-Tux.
From: Mark Anderson on 17 Apr 2008 17:23
In article MaxFreedom(a)sws5.ornl.gov says...
> My mileage is definitely better than yours. I use LVM on dozens of
> RHEL 3/4/5 and Fedora 5/6/7/8 systems, and have never had a single
> problem with it.

Here's an incident that I recently had to endure. Awhile ago I rebuilt
one of my linux servers to run RHEL5 on a new physical drive. I took
the physical drive that was running FC4 and just made it a slave to
serve files with its OS intact in case I would ever need it. That drive
was partitioned with lvm. Since I was just "trying out" RHEL5 for a few
months (I couldn't get any updates) I went to install FC8 on an
unformatted partition on that drive that I had set aside for this very
purpose. Something happened and the install went FUBAR. I had to fsck
that drive manually to get everything back from the RHEL5 partition.
For some reason, the slave drive, a drive that shouldn't have had
anything to do with the install, wasn't recognized. Panic ensued since
I had a lot of unbacked up data on there (I know it's my own damn fault
for that but still).

I then removed that FC4 drive, put it in a new system to boot on its own
and still -- nothing. I then did a live boot from the FC8 CD and found
that for some reason the lvm mapping changed between FC4 and FC8. The
old mapping was /dev/mapper/VolGroup00/LogVol00. The new mapping was
/dev/mapper/VolGroup00-LogVol00. All I had to do was change /etc/fstab
but it did put a big scare in me. I thought the installer deleted the
entire logical partition.

I really don't see any advantages to logical partitions over regular
partitions or understand how logical partitions are more stable than
regular partitions. I'm sure someone saw a value in them or they never
would have been developed. I've always used the KISS approach when
using computers. Unfortunately, that FC4 physical disk partitioned with
lvm will be that way for the foreseeable future so I still have to keep
up to date with it.

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