Yes it is indeed difficult to find a good balance between asking 
multiple things in one email and risk that not all are answered, or 
putting them as individual questions. 


-----Original Message-----
From: David Turner [mailto:drakonst...@gmail.com] 
Sent: donderdag 31 mei 2018 23:50
To: Marc Roos
Cc: ceph-users
Subject: Re: [ceph-users] Why the change from ceph-disk to ceph-volume 
and lvm? (and just not stick with direct disk access)

You are also making this entire conversation INCREDIBLY difficult to 
follow by creating so many new email threads instead of sticking with 
one.

On Thu, May 31, 2018 at 5:48 PM David Turner <drakonst...@gmail.com> 
wrote:


        Your question assumes that ceph-disk was a good piece of software.  
It had a bug list a mile long and nobody working on it.  A common 
example was how simple it was to mess up any part of the dozens of 
components that allowed an OSD to autostart on boot.  One of the biggest 
problems was when ceph-disk was doing it's thing and an OSD would take 
longer than 3 minutes to start and ceph-disk would give up on it.

        That is a little bit about why a new solution was sought after and 
why ceph-disk is being removed entirely.  LVM was a choice made to 
implement something other than partitions and udev magic while still 
incorporating the information still needed from all of that in a better 
solution.  There has been a lot of talk about this on the ML.

        On Thu, May 31, 2018 at 5:23 PM Marc Roos 
<m.r...@f1-outsourcing.eu> wrote:
        


                What is the reasoning behind switching to lvm? Does it make 
sense to go 
                through (yet) another layer to access the disk? Why creating 
this 
                dependency and added complexity? It is fine as it is, or not?
                
                
                
                
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