CEPH Journal is created unsafely

[Andrew Woodward]

We prepare a raw partition for each CEPH journal device specified. Then the NUM_OSDS / JOURNAL_DEVS to assign a number of OSD's to each journal device. This is NOT OK, the OSD's can not share raw devices

<xarses> sagewk: hmm, multiple osd's appear to work with the same raw journal device
<xarses> (dumpling)
<sagewk> oh hmm, yeah it's not actually locking it.
<sagewk> that should be fixed
<sagewk> they may appear to work that way but will fail spectacularly on replay

pmanager needs to be updated so that the each journal devices is sub-divided into enough devices to provide a 1-1 mapping of devices.

pmanager should allocate for each partition the between 12-2Gb (less if less than 10% of the drive will remain free) or statically 2Gb for now if complicated to implement.

Case 1:

Journal: sdc
OSD: sdd sde sdf sdg

result pmanager should create sdc1 sdc2 sdc3 sdc4

Case 2:
Journal sdb sdc
OSD: sdd sde sdf sdg

result pmanager should create sdb1 sdb2 sdc1 sdc2

---

the fact should already be capable of pairing the OSD's and journals correctly with out modification

[Andrey Korolyov (xdeller)]

Can we just use file-based targets and one partition for every journal?

[Andrew Woodward (xarses)]

Its possible, but from IRC again.
<ishkabob> hey guys, whats the recommended filesystem for a separate journal drive?
<sagewk> ishkabob: use a raw partition (no fs)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/62497

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/62497
Committed: https://git.openstack.org/cgit/stackforge/fuel-library/commit/?id=24c1fc9a315a4fbbef03720d7b0f6d756b78fbdd
Submitter: Jenkins
Branch: master

commit 24c1fc9a315a4fbbef03720d7b0f6d756b78fbdd
Author: Ryan Moe <email address hidden>
Date: Mon Dec 16 15:02:14 2013 -0800

    Allocate separate journal partitions for each OSD

    Change-Id: Ie9cde42620ba8f63d4ef3f8b36786a9a49317e83
    Closes-bug: #1260546