Red Hat Training

A Red Hat training course is available for Red Hat Ceph Storage

Chapter 4. Known Issues

This section documents known issues found in this release of Red Hat Ceph Storage.

The "diamond" service sometimes does not start

After installing Red Hat Ceph Storage and connecting the Ceph nodes to the Calamari server, in some cases, the diamond service does not start on certain Ceph nodes despite the diamond package being installed. As a consequence, graphs in the Calamari UI are not generated for such nodes.

To work around this issue, run the following command from the administration node as root or with sudo: 

salt '*' state.highstate

(BZ#1378826)

Various race conditions occur when using "ceph-disk"

The process of preparing and activating disks using the ceph-disk utility involves also usage of the udev device manager and the systemd service manager. Consequently, various race conditions can occur causing the following problems:

  • Mount points for OSDs are duplicated
  • ceph-disk fails to activate a device even though the device has been successfully prepared with the ceph-disk prepare command
  • Some OSDs are not activated at boot time

To work around these issues, perform the steps below:

  1. Manually remove the udev rules by running the following command as root: 

    # rm /usr/lib/udev/rules.d/95-ceph-osd.rules

  2. Prepare the disks: 

    $ ceph-disk prepare

  3. Add the "ceph-disk activate-all" string to the /etc/rc.local file. Run the following command as root: 

    # echo "ceph-disk activate-all" | tee -a /etc/rc.local

  4. Reboot the system or activate the disks by running the following command as root: 

    # ceph-disk activate-all

    (BZ#1300703)

Graphs for monitor hosts are not displayed

Graphs for monitor hosts are not displayed in the Calamari server GUI when selecting them from the Graphs drop-down menu. (BZ#1223335)

Deleting large RBD images with "object map" can cause OSDs to crash

An attempt to delete a large RBD image with the object map feature enabled can cause the OSD nodes to trigger the suicide_timeout and self-terminate.

To work around this issue, remove the image manually instead of using the rbd rm command. To avoid this issue, do not enable object map on images that are hundreds of terabytes in size. (BZ#1325322)

Missing Calamari graphs

After installing a new Ceph cluster and initializing the Calamari server, Calamari graphs can be missing. The graphs are missing on any node connected to Calamari after the calamari-ctl initialize command was run. To work around this issue, run the calamari-ctl initialize and salt '*' state.highstate commands after connecting additional Ceph cluster nodes to Calamari. These commands can be run multiple times without any issues. (BZ#1273943)

Missing password field in Calamari

An attempt to create a new user in the Calamari UI fails with the password field is required error because the password field is missing from the Calamari UI. To work around this issue, use the Raw data form and create the new user by using the JSON format, for example: 

{
    "username": "user",
    "email": "user@example.com",
    "password": "password"
}

(BZ#1305478)

Upstart cannot stop or restart the initial ceph-mon process on Ubuntu

When adding a new monitor on Ubuntu, either manually or by using the ceph-deploy utility, the initial ceph-mon process cannot be stopped or restarted using the Upstart init system. To work around this issue, use the pkill utility or reboot the system to stop the ceph-mon process. Then, it is possible to restart the process using Upstart as expected. (BZ#1255497)

"ice_setup" returns various errors when installing Calamari on Ubuntu

When running the ice_setup utility on Ubuntu, the utility returns various warnings, similar to the ones in the output below: 

apache2_invoke: Enable configuration javascript-common
invoke-rc.d: initscript apache2, action "reload" failed.
apache2_invoke: Enable module wsgi
Adding user postgres to group ssl-cert
Creating config file /etc/logrotate.d/postgresql-common with new version
Building PostgreSQL dictionaries from installed myspell/hunspell packages...
Removing obsolete dictionary files:
 * No PostgreSQL clusters exist; see "man pg_createcluster"
ERROR: Module version does not exist!
salt-master: no process found

These warnings do not affect the installation process of Calamari and can be safely ignored. (BZ#1305133)

The "Update" button is not disabled when a check box is cleared

In the Calamari web UI on the Manage > Cluster Settings page, the Update button is not disabled when a check box is cleared. Moreover, further clicking on the Update button displays an error dialog box, which leaves the button unusable. To work around this issue, reload the page as suggested in the error dialog. (BZ#1223656)

Creating encrypted OSD sometimes fails

When creating encrypted OSD nodes by using the --dmcrypt option with the ceph-deploy utility, the underlying ceph-disk utility fails to create second journal partition on same journal device that is used by another OSD. (BZ#1327628)