Planet Ceph

Aggregated news from external sources

  • June 11, 2013
    Ceph RBD Online Resize

    Extend rbd drive with libvirt and XFS

    First, resize the device on the physical host.

    Get the current size :

    $ qemu-img info -f rbd "rbd:rbd/myrbd"

    Be careful, you must specify a bigger size, shrink a volume is destructive for the FS.

    $ qemu-img resize -f rbd "rbd:rbd/myrbd" 600G

    List device define for myVM :

    $ virsh domblklist myVM

    Resize libvirt blockdevice :

    $ virsh blockresize --domain myVM --path vdb --size 600G
    $ rbd info rbd/myrb

    Extend xfs on guest :

    $ xfs_growfs /mnt/rbd/myrbd

    Extend rbd with kernel module

    You need at least kernel 3.10 on ceph client to support resizing.
    For previous version look at

    Get current size :

    $ rbd info rbd/myrbd

    Just do :

    $ rbd resize rbd/myrbd --size 600000
    $ xfs_growfs /mnt/rbd/myrbd

    Also, since cuttlefish you can’t shrink a bloc device without specify additional option (–allow-shrink)

  • June 3, 2013
    Ceph integration in OpenStack: Grizzly update and roadmap for Havana

    What a perfect picture, a Cephalopod smoking a cigar! Updates!
    The OpenStack developer summit was great and obviously one of the most exciting session was the one about the Ceph integration with OpenStack.
    I had the great pleasure to attend this sess…

  • May 16, 2013
    ViPR: A software-defined storage mullet?

    Almost every few weeks, new storage products are announced by competitors and I generally avoid commenting on them. But EMC’s ViPR announcement contains attempts to perform both marketing and technical sleight of hand around software-defined storage that potentially do much to slow down the inevitable change that is coming to the storage market. While EMC […]

  • May 13, 2013
    Deploy a Ceph MDS server

    How-to quickly deploy a MDS server.

    Assuming that /var/lib/ceph/mds/mds is the mds data point.

    Edit ceph.conf and add a MDS section like so:

    mds data = /var/lib/ceph/mds/mds.$id
    keyring = /var/lib/ceph/mds/mds.$id/mds.$id.keyring


  • May 11, 2013
    What a Year 1!

    Back in January I posted about how Inktank’s momentum was accelerating. Well, to say this trend is continuing would be a gross understatement. The Inktank team continues to execute at a blinding pace and the world keeps on noticing. For example: •    The Community and Marketing (we are hiring) teams killed it at the OpenStack Summit. There […]

  • May 7, 2013
    Use existing RBD images and put it into Glance

    The title of the article is not that explicit, actually I had trouble to find a proper one. Thus let me clarify a bit. Here is the context I was wondering if Glance was capable of converting images within its store. The quick answer is no, but I thin…

  • May 7, 2013
    Ceph Cuttlefish Release has Arrived!

    ­­Today marks another milestone for Ceph with the release of Cuttlefish (v0.61), the third stable release of Ceph. Inktank’s development efforts for the Cuttlefish release have been focused around Red Hat support and making it easier to install and configure Ceph while improving the operational ease of integrating with 3rd party tools, such as provisioning […]

  • April 25, 2013
    Ceph Community Expands “Geek on Duty”

    Last month Inktank launched a community help program that we called “Office Hours” in an attempt to provide specific hours where an engineer would be available to answer questions from the community. These efforts have done a lot for both the ability to answer questions, as well as the ability for our engineers to focus […]

  • April 25, 2013
    Ceph and Cinder multi-backend

    Grizzly brought the multi-backend functionality to cinder and tons of new drivers. The main purpose of this article is to demonstrate how we can take advantage of the tiering capability of Ceph.

    I. Ceph

    To configure Ceph to use different storage…

  • April 22, 2013
    Play with Ceph – Vagrant Box

    Materials to start playing with Ceph. This Vagrant box contains a all-in-one Ceph installation.

    I. Setup

    First Download and Install Vagrant.

    Download the Ceph box: here. This box contains one virtual machine:

    Ceph VM contains 2 OSDs (1 disk e…

  • April 15, 2013
    Ceph Mania

    Ceph is super hot. When people tell me that storage can’t be sexy, I can’t help but feel like Ceph can be! I was out in our L.A. office last week, and the first thing I saw when I showed up was this: A Ceph fanboy working with a multi-petabyte deployment of Ceph decided to […]

  • April 15, 2013
    One More chef-client Run

    Carrying on from my last post, the failed chef-client run came down to the init script in ceph 0.56 not yet knowing how to iterate /var/lib/ceph/{mon,osd,mds} and automatically start the appropriate daemons. This functionality seems to have been introduced in 0.58 or so by commit c8f528a. So I gave it another shot with a build …Read more