Ephemeral storage openstack11/14/2023 ![]() ![]() cinder-volume – Manages Block Storage devices, specifically the back-end devices themselves.Depending upon your configuration, this may be simple round-robin scheduling to the running volume services, or it can be more sophisticated through the use of the Filter Scheduler. cinder-scheduler – Schedules and routes requests to the appropriate volume service.It supports the OpenStack APIs only, although there is a translation that can be done through Nova’s EC2 interface, which calls in to the cinder client. cinder-api – A WSGI app that authenticates and routes requests throughout the Block Storage service.A Cinder volume can be used as the boot disk for a Cloud instance in that scenario, an ephemeral disk is not required.Īs seen in the diagram above from Avishay traeger of IBM, the Cinder block service is delivered using the following daemons:.Using a dedicated storage node or storage subsystem to host Cinder volumes, capacity can be provided that is greater than what is available via the direct-attached storage in the compute nodes (Note that is also true if using NFS with shared storage but without data persistence).If a compute node crashes, you can launch new instances on surviving compute nodes and attach Cinder volumes to those new instances with data intact. ![]()
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