Re: Ceph disk

[Loic Dachary <loic@dachary.org>]

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[cc'ing ceph-devel public mailing list]

Hi,

On 31/03/2015 20:47, Kewaan Ejaz wrote:
> Hello Loic,
> 
> Thank you again for the opportunity to contribute to ceph. I am not sure
> how am I suppose to proceed but I have the following things in mind;

Thanks for proposing to help :-)

> 1) Fully understanding the ceph-disk code
> 2) I would start using the ceph-disk in my sandbox environment
> (Virtualbox)

You'll find that it's fairly straightforward: one file, all in it. There is room for improvement.

https://ceph.com/git/?p=ceph.git;a=blob;f=src/test/ceph-disk.sh are the tests that make check will run 
https://ceph.com/git/?p=ceph.git;a=blob;f=src/test/ceph-disk-root.sh are the tests that make check will run if ./configure --enable-root-make-check is used but you can also run one manually with cd src ; sudo test/ceph-disk.sh test_activate_dev and it will use the /dev/loop device to simulate a disk. A few sanity checks were added recently to verify that the loop device has been loaded with the necessary loop.max_part=16 (or more) parameter and that /dev/disk/part-byuuid is populated as expected. 

> I think I would require a week to get back to you. But other than that,
> let me know what kind of VM do you have in mind. For example,
> 
> 1) What kind of OS would you prefer from the Openstack cluster?

I feel more confortable with Debian or Ubuntu but CentOS or Fedora are also fine. What is required for test purposes is a dedicated tenant with the ability to run two virtual machines, 1GB RAM, 10GB disk, 1core. We would need a variety of images to test against (Ubuntu 12.04 + 14.04, Debian jessie, CentOS 7 + 6, Fedora 20 + 21, OpenSUSE 13.2).

> 2) We are not using Cinder or Swift in our Openstack cluster. Is that a
> Problem?

That will be fine: the loop device can be used as a spare disk instead of provisioning one with cinder. 

As soon as you can have that OpenStack tenant ready, it can be used with https://github.com/osynge/whatenv to run tests for https://github.com/ceph/ceph/pull/4036 and verify that the detection system actually works as expected. 

And once it's done, we could make it so this test is run whenever a pull request is posted that modifies ceph-disk and ensure we're not risking a regression. It would be a very valuable service. Not too CPU intensive either since we're not seeing more than a few patches on ceph-disk every month.

Cheers

> Best Regards,
> Kewaan.


-- 
Loïc Dachary, Artisan Logiciel Libre


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