CentOS - Jun 2015 - LVM hatred, was Re: /boot on a separate partition?

On 6/24/2015 1:06 PM, m.roth at 5-cent.us wrote:
> Gordon Messmer wrote:
>> On 06/23/2015 08:10 PM, Marko Vojinovic wrote:
>>> Ok, you made me curious. Just how dramatic can it be? From where
I'm
>>> sitting, a read/write to a disk takes the amount of time it takes,
the
>>> hardware has a certain physical speed, regardless of the presence
of
>>> LVM. What am I missing?
>> Well, there's best and worst case scenarios.  Best case for
file-backed
>> VMs is pre-allocated files.  It takes up more space, and takes a while
>> to set up initially, but it skips block allocation and probably some
>> fragmentation performance hits later.
>>
>> Worst case, though, is sparse files.  In such a setup, when you write a
>> new file in a guest, the kernel writes the metadata to the journal,
then
> <MVNCH>
>
> Here's a question: all of the arguments you're giving have to do
with VMs.
> Do you have some for straight-on-the-server, non-VM cases?
>
>        mark
>
>
Is there an easy to follow "howto" for normal LVM administration
tasks. I get
tired of googling every-time I have to do something I don't remember how to
do
regarding LVM, so I usually just don't bother with it at all.

I believe it has some benefit for my use cases, but I've been reticent to
use
it, since the last time I got LVM problems, I lost everything on the volume, and
had to restore from backups anyway. I suspect I shot myself in the foot, but I
still don't know for sure.

thanks,
-chuck

--

On 6/24/2015 3:11 PM, Chuck Campbell wrote:
> Is there an easy to follow "howto" for normal LVM administration 
> tasks. I get tired of googling every-time I have to do something I 
> don't remember how to do regarding LVM, so I usually just don't
bother
> with it at all. I believe it has some benefit for my use cases, but 
> I've been reticent to use it, since the last time I got LVM problems, 
> I lost everything on the volume, and had to restore from backups 
> anyway. I suspect I shot myself in the foot, but I still don't know 
> for sure. thanks, -chuck
>
Gentoo Wiki has a pretty good "cheat sheet" on it:

https://wiki.gentoo.org/wiki/LVM

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On Thu, Jun 25, 2015 at 10:49:57AM -0500, Jason Warr
wrote:
> 
> 
> On 6/24/2015 3:11 PM, Chuck Campbell wrote:
> >Is there an easy to follow "howto" for normal LVM
administration
> >tasks. I get tired of googling every-time I have to do something I
> >don't remember how to do regarding LVM, so I usually just don't
> >bother with it at all. I believe it has some benefit for my use
> >cases, but I've been reticent to use it, since the last time I got
> >LVM problems, I lost everything on the volume, and had to restore
> >from backups anyway. I suspect I shot myself in the foot, but I
> >still don't know for sure. thanks, -chuck
> >
> Gentoo Wiki has a pretty good "cheat sheet" on it:
> 
> https://wiki.gentoo.org/wiki/LVM
I have my own page, limited and out of date but..

http://srobb.net/lvm.html

-- 
Scott Robbins
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