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

  • August 24, 2014
    Update: OpenStack Summit Paris 2014 – CFS

    An update on my talk submission for the OpenStack summit this year in Paris: my speech about Ceph performance analysis was not chosen by the committee for the official agenda. But at least one piece of good news: Marc’s talk will be part of t…

  • August 14, 2014
    Tell teuthology to use a local ceph-qa-suite directory

    By default teuthology will clone the ceph-qa-suite repository and use the tasks it contains. If tasks have been modified localy, teuthology can be instructed to use a local directory by inserting something like: suite_path: /home/loic/software/ceph/ceph-qa-suite in the teuthology job yaml … Continue reading

  • August 10, 2014
    A new Ceph mirror on the east coast

    I’m glad to announce that Ceph is now part of the mirrors iWeb provides.

    It is available in both IPv4 and IPv6 by:

    The mirror provides 4 Gbps of connectivity and is located on the eastern coast of Canada, more precisely in Montreal, Quebec.

    We feel this complements very well the principal ceph mirror at ceph.com located on the west coast and the european mirror on eu.ceph.com.

    Feel free to give it a try and let me know if you see any problems !

  • August 2, 2014
    OpenStack Summit Paris 2014 – CFS

    The Call for Speakers period for the OpenStack Summit from 03. – 07.11.2014 in Paris ended this week. Now the voting for the submitted talks started and ends at 11:59pm CDT on August 6. (6:59 am CEST on 7. August).I’ve submitted a talk to the stor…

  • August 2, 2014
    Temporarily disable Ceph scrubbing to resolve high IO load

    In a Ceph cluster with low bandwidth, the root disk of an OpenStack instance became extremely slow during days. When an OSD is scrubbing a placement group, it has a significant impact on performances and this is expected, for a … Continue reading

  • July 31, 2014
    Brace yourself, DevStack Ceph is here!

    For more than a year, Ceph has become increasingly popular and saw several deployments inside and outside OpenStack. For those of you who do not know Ceph is unified, distributed and massively scalable open source storage technology that provides several ways to access and consume your data such as object, block and filesystem. The community and Ceph itself has greatly… Read more →

  • July 4, 2014
    Ceph disaster recovery scenario

    A datacenter containing three hosts of a non profit Ceph and OpenStack cluster suddenly lost connectivity and it could not be restored within 24h. The corresponding OSDs were marked out manually. The Ceph pool dedicated to this datacenter became unavailable … Continue reading

  • June 28, 2014
    puppet-ceph update

    End of last year, a new puppet-ceph module was bootstrapped with the ambitious goal to re-unite the dozens of individual efforts. I’m very happy with what we’ve accomplished. We are making progress although our community is mixed, but more importantly, … Continue reading

  • June 28, 2014
    Ceph erasure code jerasure plugin benchmarks (Highbank ARMv7)

    The benchmark described for Intel Xeon is run with a Highbank ARMv7 Processor rev 0 (v7l) processor (the maker of the processor was Calxeda ), using the same codebase: The encoding speed is ~450MB/s for K=2,M=1 (i.e. a RAID5 equivalent) … Continue reading

  • June 25, 2014
    CDS Giant and Hammer

    Today is the second day of the Ceph Developer Summit (CDS) for the Giant and Hammer release. We had already several interesting topics and discussions yesterday on the first day.It’s 01:00 in CEST, so now is the time for you to join if you are interest…

  • June 25, 2014
    workaround DNSError when running teuthology-suite

    Note: this is only useful for people with access to the Ceph lab. When running a Ceph integration tests using teuthology, it may fail because of a DNS resolution problem with: $ ./virtualenv/bin/teuthology-suite –base ~/software/ceph/ceph-qa-suite \ –suite upgrade/firefly-x \ –ceph … Continue reading

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