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[OpenStack Infra <1690890@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/464726
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=902b7bf6f5425824a0661b8e4beac4a894749c03
Submitter: Jenkins
Branch:    master

commit 902b7bf6f5425824a0661b8e4beac4a894749c03
Author: Chris Friesen <chris.friesen@xxxxxxxxxxxxx>
Date:   Mon May 15 12:48:37 2017 -0600

    fix InvalidSharedStorage exception message
    
    The exception message for InvalidSharedStorage is grammatically
    complex and ignores the possibility of block migration, which
    results in a misleading and confusing message for the user.
    
    Change it to something simpler and more accurate.
    
    Change-Id: Icfc8e151a4ea36ec303f0b8c2e1dc9e6f0bd5925
    Closes-Bug: #1690890


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1690890

Title:
  error message not clear for shared live migration with block storage

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  When using an older microversion (2.25 or earlier) with boot-from-
  image, and the user forgets to specify block-migration, the error
  message returned is this:

  "Live migration can not be used without shared storage except a booted
  from volume VM which does not have a local disk."

  This has a couple things wrong with it. First, the triple-negative is
  a bit confusing, especially for non-native-english speakers.  Second,
  it implies that you cannot do a block migration, which is obviously
  false.

  I think a more clear error message would be something like:

  "Shared storage migration requires either shared storage or boot-from-
  volume with no local disks."

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