Re: Why lvm is recommended method for bleustore

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Le dimanche 22 juillet 2018 à 09:51 -0400, Satish Patel a écrit :
> I read that post and that's why I open this thread for few more
> questions and clearence,
> 
> When you said OSD doesn't come up what actually that means?  After
> reboot of node or after service restart or installation of new disk?
> 
> You said we are using manual method what is that? 
> 
> I'm building new cluster and had zero prior experience so how can I
> produce this error to see lvm is really life saving tool here? I'm
> sure there are plenty of people using but I didn't find and good
> document except that mailing list which raising more questions in my
> mind. 

When I had to change a few drives manually, copying the old contents
over, I noticed that the logical volumes are tagged with lots of
information related to how they should be handled at boot time by the
OSD startup system.
These LVM tags are a good standard way to add that meta-data within the
volumes themselves. Apparently, there is no other way to add these tags
that allow for bluestore/filestore, SATA/SAS/NVMe, whole drive or
partition, etc.
They are easy to manage and fail-safe in many configurations.

> Sent from my iPhone
> 
> > On Jul 22, 2018, at 6:31 AM, Marc Roos <M.Roos@xxxxxxxxxxxxxxxxx>
> > wrote:
> > 
> > 
> > 
> > I don’t think it will get any more basic than that. Or maybe this?
> > If 
> > the doctor diagnoses you, you can either accept this, get 2nd
> > opinion, 
> > or study medicine to verify it. 
> > 
> > In short lvm has been introduced to solve some issues of related
> > to 
> > starting osd's (which I did not have, probably because of a
> > 'manual' 
> > configuration). And it opens the ability to support (more future) 
> > devices.
> > 
> > I gave you two links, did you read the whole thread?
> > https://www.mail-archive.com/ceph-users@xxxxxxxxxxxxxx/msg47802.htm
> > l
> > 
> > 
> > 
> > 
> > 
> > -----Original Message-----
> > From: Satish Patel [mailto:satish.txt@xxxxxxxxx] ;
> > Sent: zaterdag 21 juli 2018 20:59
> > To: ceph-users
> > Subject:  Why lvm is recommended method for bleustore
> > 
> > Folks,
> > 
> > I think i am going to boil ocean here, I google a lot about this
> > topic 
> > why lvm is recommended method for bluestore, but didn't find any
> > good 
> > and detail explanation, not even in Ceph official website.
> > 
> > Can someone explain here in basic language because i am no way
> > expert so 
> > just want to understand what is the advantage of adding extra layer
> > of 
> > complexity?
> > 
> > I found this post but its not i got lost reading it and want to see
> > what 
> > other folks suggesting and offering in their language 
> > https://www.mail-archive.com/ceph-users@xxxxxxxxxxxxxx/msg46768.htm
> > l
> > 
> > ~S
> > _______________________________________________
> > ceph-users mailing list
> > ceph-users@xxxxxxxxxxxxxx
> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> > 
> > 
> 
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-- 
Nicolas Huillard
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