Storage


Revamping iSCSI connections in OpenStack

So you may have read my previous post about iSCSI multipathing in OpenStack and decided to try the new code, and everything seemed to be working fine, but then you start pushing it more and more and you find yourself back at a point were thinks don’t go as expected, so what’s the deal there? Were the issues fixed or not? The sort answer is yes and no, but let’s see what I mean by this. Issues At Red Hat […]


Standalone Cinder: The definitive SDS 3

Are you looking for the best Software Defined Storage in the market? Look no further, Standalone Cinder is here! Let’s have an overview of the Standalone Cinder service, see some specific configurations, and find out how to make requests with no other OpenStack service is deployed. Cinder Until not so long ago Cinder was always mentioned in an OpenStack context, but for some time now you could hear conversations where Cinder was standing on its own and was discussed as […]


Cinder’s Ceph Replication Sneak peek 9

Have you been dying to try out the Volume Replication functionality in OpenStack but you didn’t have some enterprise level storage with replication features lying around for you to play with? Then you are in luck!, because thanks to Ceph’s new RBD mirroring functionality and Jon Bernard’s work on Cinder, you can now have the full replication experience using your commodity hardware and I’m going to tell you how you can have a preview of what’s about to come to […]


Manual validation of Cinder A/A patches 4

In the Cinder Midcycle I agreed to create some sort of document explaining the manual tests I’ve been doing to validate the work on Cinder’s Active-Active High Availability -as a starting point for other testers and for the automation of the tests- and writing a blog post was the most convenient way for me to do so, so here it is. Scope The Active-Active High Availability work in Cinder is formed by a good number of specs and patches, and […]


Cinder Active-Active HA – Newton mid-cycle

Last week took place the OpenStack Cinder mid-cycle sprint in Fort Collins, and on the first day we discussed the Active-Active HA effort that’s been going on for a while now and the plans for the future. This is a summary of that session. Just like in previous mid-cycles the Cinder community did its best to accommodate remote attendees and make them feel included in the sessions with hangouts, live video streaming, IRC pings as reminders, and even moving the […]


In-use Volume Backups in Cinder 3

Prior to the Liberty release of OpenStack, Cinder backup functionality was limited to available volumes; but in the latest L release, the possibility to create backups of in-use volumes was added, so let’s have a look into how this is done inside Cinder. Before Liberty If you have worked before with backups in Cinder you certainly know that you have to make sure your volumes are in available state before you can back them up, which meant that for in-use […]


Inside Cinder’s Incremental Backup 8

I’ve been asked a couple of times how Cinder’s Incremental Backup works and what do I actually mean when I say we need to rework Ceph’s Backup driver to support Cinder’s Incremental Backup. So I’ll try to explain both in this post. Backup Workflow Incremental Backup in Cinder was designed with Swift back-end in mind, so reference implementation is versatile enough to handle size limitations on the back-end, and new drivers can relatively easily extend from this implementation to support […]


Cinder Volume Back Up Automation 7

In my previous post on OpenStack’s volume backups I gave an overview of Cinder’s Backup service current status and I mentioned that some of the limitations that currently exist could be easily overcome scripting a helper tool. In this post I’m going to explain different options to create such a script and provide one as a sample/reference. Automate what? Among current Cinder Backup service limitations these are some things that can be automated: Backup in-use volumes keeping reference to original […]


OpenStack’s Volume Backup Status 5

Why Back Up Cloud Volumes? When working in the Cloud the idea of doing backups like in the old days may seen counter intuitive. After all, the main reasons for having backups are recovering data after it’s lost, by deletion or corruption, and recovering it from an earlier time, and you have those covered with fast volume snapshots and the use of fault tolerant back-ends like Ceph, that replicate data, for your volumes. So, why would you still need old […]