Sébastien Han

Quick script to evaluate the placement of the objects contained in a RBD image.

#!/bin/bash

# USAGE
# ./rbd-loc <pool> <image>

if [ -z ${1} ] || [ -z ${2} ];
then
    echo "USAGE: ./rbd-loc <pool> <image>"
    exit 1
fi

rbd_prefix=$(rbd -p ${1} info ${2} | grep block_name_prefix | awk '{print $2}')
for i in $(rados -p ${1} ls | grep ${rbd_prefix})
do
    ceph osd map ${1} ${i}
done

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The goal of this little analysis was to determine the overhead generated by Ceph. One important point was also to estimate the deviance brought by Ceph between RAW IOs from disk and Ceph IOs.

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A quick post to tell everybody that I’ll be giving a presentation at the Ceph day in London. Obviously, I’ll be representing the company I work for, eNovance. The event is next Wednesday, October 9, 2013. I am going to talk about Ceph, performance and benchmarking. You can check the details and schedule of the event here. See you there!

Update: slides available through my employer’s blog (eNovance).

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Today the CoreOS team released its first OpenStack image. Let’s quickly see how we can take advantage of it.

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By default, OpenStack doesn’t use any caching. However, you might want to enable the RBD caching.

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I simply collected all my localrc files and combined them into a single one. Feel free to grab the parts that interest you.

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DevStack in 1 minute! Ready, steady, GO!

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It’s not really clear from the command line

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The road to Havana is long, no milestone in the corner yet, but already some enhancements have been brought to the Horizon interface. Let’s take a quick look at the new fancy stuff!

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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 session (led by Josh Durgin from Inktank). The session was too short, but we had enough time to discuss upcoming features and establish a proper roadmap. With the help of this article, I’d like to share some of the discussions that we had and blueprints that we wrote.

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