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

Wed Jun 24 18:06:30 UTC 2015
m.roth at 5-cent.us <m.roth at 5-cent.us>

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?