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Bug 1519853 - [Docs] Admin Guide requires clarifications regarding OSD instructions
Summary: [Docs] Admin Guide requires clarifications regarding OSD instructions
Alias: None
Product: Red Hat Ceph Storage
Classification: Red Hat
Component: Documentation
Version: 3.0
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: 3.1
Assignee: Aron Gunn
QA Contact: Parikshith
Depends On:
TreeView+ depends on / blocked
Reported: 2017-12-01 14:50 UTC by
Modified: 2018-08-17 11:27 UTC (History)
3 users (show)

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Attachments (Terms of Use)
Notes for recommended changes (deleted)
2017-12-01 14:50 UTC,
no flags Details

Description 2017-12-01 14:50:06 UTC
Created attachment 1361628 [details]
Notes for recommended changes

Description of problem:
Some commands and examples in the "6.3.3. Adding an OSD with the Command Line Interface" of the RHCS 3.0 Administration Guide require updates/clarifications as described below and in attachment.

[From Randy Martinez]

I have some additional updates for RHCS 3.0 documentation:

1. The parted cmd on pg. 61 should be updated to reflect how ceph by
default names data partitions "ceph data", instead of "primary":
REF: "parted <path_to_disk> mkpart primary <start> <end>"
if that doesn't happen then it can be resolved with: " sgdisk
--change-name="1:ceph data" /dev/sdb"

2. pg. 62
"1. Initialize the OSD data directory: ceph-osd -i --mkfs --mkkey
--osd-uuid "... This does not create file `journal_uuid`, nor is it
mentioned in the docs to do so additionally. This is simply a file in
osd/ceph-<id> with the journal partuuid in it. Why does this matter? Well
if you have OCD and ever want `ceph-disk list` to map properly this file
must be present with the partuuid. Not to mention it poses a potential
problem for someone in operations who doesn't know better, and thinks that
the part isn't being used anymore during hardware failure scenarios.
To resolve: echo "<Journal_partuuid>" >
/var/lib/ceph/osd/ceph-<id>/journal_uuid; chown ceph:ceph !$. This will
turn things back to normal.
REF: ceph-disk list - Before journal_uuid present
 /dev/nvme1n1p2 ceph journal
/dev/sdb :
 /dev/sdb1 ceph data, active, cluster ceph, osd.319
 /dev/nvme1n1p2 ceph journal, for /dev/sdb1
/dev/sdb :
 /dev/sdb1 ceph data, active, cluster ceph, osd.319, journal /dev/nvme1n1p2

*Note: the OSD itself doesn't care so long as journal is linked, I do

3. Creating key manually for OSD is missing mgr permissions: `mgr 'allow
profile osd'` from pg. 63

I've attached my notes start->Finish on how to replace an OSD, and "Re-Use"
existing journal partition(Scenario: Spinner dies; NVME is dedicated
journal for multiple spinners; Re-use old part). This is likely going to be
the #1 request from our larger customers as rebooting is seldom ideal, and
I don't think ceph-ansible will do it properly. Let me know if you need

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