On 22-7-2018 15:51, Satish Patel wrote:
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.
Satish
It is a choice made during the design of the new setup with ceph-volume.
For reasons set out by Sage in one of the refered posts.
Just as there are many engineering questions that get solved by
selecting a tool that does the work, in this case LVM.
And I do not think it was given a huge amount of consideration to use
it. If I would guess the possibility to hard add attributes to volumes
is going to be one of the selectors.
(I'm not even sure the if an alternative low impact middle layer that
can do disk abstraction on Linux)
LVM is sort of a first tool of trade if you do not want to deal with the
raw disks...
And as Marc said: You need to start a full study on the possible
alternatives to the raised questions.
I personally would not waste the time for that. On the developers list
it has been gone over a few post about ceph-volume and things were
rarely about the selection of LVM.
--WjW
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.html
-----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.html
~S
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