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 […]

iSCSI multipath issues in OpenStack 5

Multipathing is a technique frequently used in enterprise deployments to increase throughput and reliability on external storage connections, and it’s been a little bit of a pain in the neck for OpenStack users. If you’ve nodded while reading the previous statement, then this post will probably be of interest to you, as we’ll be going over some iSCSI multipath issues found in OpenStack and how they can be solved. Pain in the neck Multipath is a great feature that we […]

Standalone Cinder: The definitive SDS 7

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 […]

db connections

# of DB connections in OpenStack services 2

The other day someone asked me if the SQLAlchemy connections to the DB where per worker or shared among all workers, and what was the number of connections that should be expected from an OpenStack service. Maybe you have also wondered about this at some point, wonder no more, here’s a quick write up summarizing it. OpenStack services use Oslo DB library for database access, which in turn uses the SQLAlchemy library as the ORM, so we define our connection […]

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 […]

VBox & VMware in SecureBoot Linux (2016 Update) 19

If you have a Linux system running in Secure Boot and you install VirtualBox or VMware player you will see, with some frustration, that you won’t be able to run any VMs. This post also applies if you are running your system with module signature verification enabled (CONFIG_MODULE_SIG) even if it’s not running in Secure Boot. This is an old issue, and I’ve already written about it in another post almost 2 years ago, but at this point some degree […]

Mitaka Cinder Recap sessions

During Mitaka we introduced some big changes in Cinder that have a great impact for developers working on new and existing functionality. These new features include, but are not limited to, API microversions, support for Rolling Upgrades, and conditional DB update functionality to remove API races. So we decided to have Recap Sessions during the OpenStack Summit in Austin. The idea behind this was to facilitate adoption and reduce bugs by focusing on explaining how the functionality should be used, […]

Learning something new about Oslo Versioned Objects 2

If you work on an OpenStack project that is in the process of adopting Versioned Objects or has recently adopted them, like we have in Cinder, you’ve probably done some code reviews, and even implemented a couple of Versioned Objects yourself, and are probably thinking that you know your way around them pretty well, but maybe there are some gaps in that knowledge that you are not aware of, specially if you are taking Nova’s or Cinder’s code as reference, […]