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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

(3:21:42 PM) jgriffith: I think I'll have Cinder check for the metadata
setting and use it

Given ^ I'm going to confirm this for Cinder and mark it as invalid for
Nova.

** Changed in: nova
       Status: New => Invalid

** Changed in: cinder
       Status: New => Confirmed

** Changed in: cinder
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1741476

Title:
  Attaching read-only volumes fails

Status in Cinder:
  Confirmed
Status in OpenStack Compute (nova):
  Invalid

Bug description:
  The introduction of "new style volume attachments" seems to have
  caused a regression, breaking read-only volume attachments.

  Trace: http://paste.openstack.org/raw/639120/

  The reason seems to be the fact that Cinder expects the connector
  provided through the "attachment_update" call to include the requested
  attach mode [1], otherwise assuming it to be 'rw'. As Nova won't
  provide it, Cinder will then error because of an access mode mismatch.

  [1]
  https://github.com/openstack/cinder/blob/d96b6dfba03424baf8b3ddc7539347554892e941/cinder/volume/manager.py#L4374-L4393

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