yahoo-eng-team team mailing list archive

[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => juno-3

-- 
You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1226351

Title:
  Make RBD Usable for Ephemeral Storage

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  Currently in Havana development, RBD as ephemeral storage has serious stability
  and performance issues that makes the Ceph cluster a bottleneck for using an
  image as a source.

  Nova has to currently communicate with the external service Glance, which has
  to talk to the separate Ceph storage backend to fetch path information. The
  entire image is then downloaded to local disk, and then imported from local
  disk to RBD. This leaves a stability concern, especially with large images for
  the instance to be successfully created.

  This can be eliminated by instead having Nova's RBD image backend utility
  communicate directly with the Ceph backend to do a copy-on-write of the image.
  Not only does this greatly improve stability, but performance is drastically
  improved by not having to do a full copy of the image.

To manage notifications about this bug go to:
https://bugs.launchpad.net/nova/+bug/1226351/+subscriptions