How Cinder work

asked 2017-04-26 02:49:45 -0500

Kyi Soe Thin gravatar image

Hi I want to verify my understanding about cinder. Cinder need physical block storage volume. If it does not exist , it build a virtual disk and create a loopback device . Am I right ?

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No. Cinder uses so-called backends - LVM, NFS, disk arrays, Ceph or other provider of disk space. A Cinder volume corresponds to an entity on that backend - logical volume, NFS file, disk array LUN, Ceph RBD device etc, which can then be attached to an instance. Attachment method depends on backend.

Bernd Bausch gravatar imageBernd Bausch ( 2017-04-26 05:02:28 -0500 )edit

You think about loopback devices because POC solutions like Packstack or DevStack use them as physical volumes for a Cinder LVM backend. Loopback devices have nothing to do with Cinder.

Bernd Bausch gravatar imageBernd Bausch ( 2017-04-26 05:04:20 -0500 )edit