rbd

About RBD, Rados Block Device

About RBD, Rados Block Device 2560 1437 Michiel Manten

For anybody enjoying Latin pop in the 2000’s, RBD was a popular Mexican pop band from Mexico City labelled by EMI Virgin. The group achieved international success from 2004 until their separation in 2009 and sold over 15 million records worldwide, making them one of the best-selling Latin music artists of all time. The group…

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A huge thanks to Sage Weil

A huge thanks to Sage Weil 1740 1160 Michiel Manten

Ceph was developed by Sage Weil in 2003 as a part of his PhD project. It was open sourced in 2006 to serve as a reference implementation and research platform. DreamHost, a Los-Angeles-based web hosting and domain registrar company also co-founded by Sage Weil, supported Ceph development from 2007 to 2011. During this period Ceph as we know it took shape: the core…

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What about our Ceph Fundamentals training?

What about our Ceph Fundamentals training? 1740 1160 Michiel Manten

Currently we are planning a new Ceph Fundamentals training course for November or December. Because of this we thought it would be nice to share some more information on the topics of this training course. The 42on Ceph Fundamentals Training is a 2 day online, instructor led training course. The training is led by one…

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5 more ways to break your Ceph cluster

5 more ways to break your Ceph cluster 1650 1100 Michiel Manten

While we’ve been working with customers using Ceph in a variety of ways, we have encountered some several ways to break your Ceph cluster. In that light, here is an update on five more ways to break your Ceph cluster as a continuation of the original presentation done by Wido den Hollander which is called;…

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Using TRIM/DISCARD with Ceph RBD and libvirt

Using TRIM/DISCARD with Ceph RBD and libvirt 1500 1000 Wido den Hollander

TRIM/DISCARD Using TRIM/DISCARD you can give back free space to a Ceph cluster. Normally, any thin provisioned block device will keep on growing until its maximum size while being used. Using the DISCARD command a underlying block device can be instructed to discard blocks which do not contain data. In the case of Ceph’s RBD…

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Protecting your Ceph pools against removal or property changes

Protecting your Ceph pools against removal or property changes 1506 1001 Wido den Hollander

One of the dangers of Ceph was that by accident you could remove a multi TerraByte pool and loose all the data. Although the CLI tools asked you for conformation, librados and all it’s bindings did not. Imagine explaining that you just removed a 200TB pool from your storage system due to a typo in…

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Rebuilding libvirt under CentOS 7.1 with RBD storage pool support

Rebuilding libvirt under CentOS 7.1 with RBD storage pool support 1494 1000 Wido den Hollander

If you want to use CentOS 7.1 for your hypervisors with Apache CloudStack and Ceph’s RBD as Primary Storage you need to rebuild libvirt. CloudStack requires libvirt to be built with RBD storage pool support. It uses libvirt to manage RBD volumes. By default libvirt under CentOS is not built with this support. (On Ubuntu…

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Deploying Ceph over IPv6

Deploying Ceph over IPv6 1500 1000 Wido den Hollander

I like to deploy Ceph clusters over IPv6. I actually think that’s the way forward. IPv4 is legacy just like iSCSI and NFS are. Last week I was at a customer deploying a new Ceph cluster and they wanted to deploy with IPv6! Most deployment I did with IPv6 were done manually and not with…

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Calculating RADOS objects for RBD images

Calculating RADOS objects for RBD images 1257 958 Wido den Hollander

Ceph’s RBD (RADOS Block Device) is just a thin wrapper on top of RADOS, the object store of Ceph. It stripes (by default) over 4MB objects in RADOS. It’s very simple to calculate which RADOS object corresponds with which sector on your RBD image/block device. First you have to find out the block device’s object…

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Safely backing up your Ceph monitors

Safely backing up your Ceph monitors 1562 1001 Wido den Hollander

So you might wonder: Why do I need to make a backup of my Ceph monitors? I have multiple monitors. That’s true, but would you run into the very unfortunate situation where you loose all you monitors, you loose all your data. The monitors contain very important metadata (pgmap, osdmap, crushmap) to run your cluster.…

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