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OpenStack Cinder Performance Testing Approach Part 1 of 2

Published at February 13, 2019 · 8 min read

NOTE: This post was initially written a few years ago, so something could be outdated. What is Cinder High-level Cinder Architecture Cinder contains 3 main components: Cinder API (c-api), Cinder Scheduler (c-sched) and Cinder Volume (c-vol). Cinder Backup is a bit different and will be described later. All Cinder components communicate between each other using RPC protocol. In our case, it’s an AMPQ protocol with RabbitMQ backend. All data is stored in the database (MySQL DB)....

Minimal OpenStack Cinder setup

Published at January 7, 2019 · 2 min read

During OpenStack Cinder development you may want to have some minimal working configuration to run the only Cinder on your environment. If you don’t need to test full volume attach flow with Nova, you may need to run only Cinder(cinder-api, cinder-scheduler, and cinder-volume, even cinder-backup is optional), RabbitMQ, and MySQL. Usually, for Cinder development, I don’t need full OpenStack up and running on my virtual machine. I just need to have only Cinder itself and such required things like database and message queue....

Using OpenStack Cinder with LIO target

Published at February 23, 2017 · 2 min read

What is LIO target? Linux-OI Target is a Linux SCSI target introduced in a kernel v.2.6.38 and supports different fabrics modules like FibreChannel, iSCSI, iSER, etc. It works in a kernel space, so it’s faster than tgtd which is used in Cinder by default. Why do we still use tgtd instead of more faster LIO in Cinder by default? It’s only because we have to support rolling upgrades and we don’t know how to migrate from TGTd to LIO in a such way and pass Grenade successfully....

Attach Cinder Volume to the Ironic Instance without Nova

Published at January 13, 2016 · 3 min read

OpenStack Cinder provides an API to attach/detach volume to Nova instances. This is public, but not documented API which is used only by Nova now. In scope of “Attach/detach volumes without Nova” [1] blueprint we introduce new python-cinderclient extension to provide attach/detach API not only for Nova called python-brick-cinderclient-ext. Before Mitaka release everybody who want to use Cinder volumes not only with Nova instances have to create hardening scripts based on python-cinderclient and os-brick [3] projects to make it done....

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