Planet Ceph

Aggregated news from external sources

  • August 31, 2014
    What cinder volume is missing an RBD object ?

    Although it is extremely unlikely to loose an object stored in Ceph, it is not impossible. When it happens to a Cinder volume based on RBD, knowing which has an object missing will help with disaster recovery. The list_missing command … Continue reading

  • May 5, 2014
    Recovering from a cinder RBD host failure

    OpenStack Havana Cinder volumes associated with a RBD Ceph pool are bound to a host. cinder service-list –host bm0014.the.re@rbd-ovh +—————+———————–+——+———+——-+ | Binary | Host | Zone | Status | State | +—————+———————–+——+———+——-+ | cinder-volume | bm0014.the.re@rbd-ovh | ovh | enabled … Continue reading

  • May 3, 2014
    Non profit OpenStack & Ceph cluster distributed over five datacenters

    A few non profit organizations (April, FSF France, tetaneutral.net…) and volunteers constantly research how to get compute, storage and bandwidth that are: 100% Free Software Content neutral Low maintenance Reliable Cheap The latest setup, in use since ocbober 2013, is … Continue reading

  • November 19, 2013
    Mixing Ceph and LVM volumes in OpenStack

    Ceph pools are defined to collocate volumes and instances in OpenStack Havana. For volumes that do not need the resilience provided by Ceph, a LVM cinder backend is defined in /etc/cinder/cinder.conf: [lvm] volume_group=cinder-volumes volume_driver=cinder.volume.drivers.lvm.LVMISCSIDriver volume_backend_name=LVM and appended to the list … Continue reading

  • November 13, 2013
    Migrating from ganeti to OpenStack via Ceph

    On ganeti, shutdown the instance and activate its disks: z2-8:~# gnt-instance shutdown nerrant Waiting for job 1089813 for nerrant… z2-8:~# gnt-instance activate-disks nerrant z2-8.host.gnt:disk/0:/dev/drbd10 On an OpenStack Havana installation using a Ceph cinder backend, create a volume with the same … Continue reading

  • November 12, 2013
    Collocating Ceph volumes and instances in a multi-datacenter setup

    OpenStack Havana is installed on machines rented from OVH and Hetzner. An aggregate is created for machines hosted at OVH and another for machines hosted at Hetzner. A Ceph cluster is created with a pool using disks from OVH and … Continue reading

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