[CentOS] LVM hatred, was Re: /boot on a separate partition?

Wed Jun 24 20:11:24 UTC 2015
Chuck Campbell <campbell at accelinc.com>

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
> 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.