How to set OSD journal device on a dedicated block device in Ceph barclamp.

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Environment

SUSE Cloud
SUSE Enterprise Storage 4

Situation

When applying Ceph barclamp after having set a dedicated block device for an OSD (Object Storage Daemon) journal in raw mode the setting is ignored:

"osd": {
"min_size_gb": 20,
"journal_size": 8192,
"journal_devices": [
"vde"
],
"use_ssd_for_journal": false

Resolution

Go back to the crowbar web ui, Barclamps, Ceph, click "raw" and in the raw json mode set the full path to the block device:

"osd": {
"min_size_gb": 20,
"journal_size": 8192,
"journal_devices": [
"/dev/vde"
],
"use_ssd_for_journal": false

Ideally, the path should be the symlink from /dev/disk/by-id/<device id> pointing to your device, which is persistent across reboots.

Finally apply Ceph barclamp.

Cause

Ruby code on the admin node /opt/dell/chef/cookbooks/ceph/recipes/osd.rb requires the full path to the device, specifying only the device name is not sufficient.

Disclaimer

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