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[wang <1872409@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Description
===========
After the volume of the two instance is formatted and mounted, write data on the Shared disk of the first instance and sync it, but it cannot be seen on the second instance. Only when the Shared disk of the second instance is mounted again after umount can you see it.

Environment
===========
1.openstack-Rcoky
2.The volume type is ceph storage
3.Shared disk cache=none
<driver name='qemu' type='raw' cache='none' discard='unmap'/>

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1872409

Title:
  Failed shared disk display data in real time

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========
  After the volume of the two instance is formatted and mounted, write data on the Shared disk of the first instance and sync it, but it cannot be seen on the second instance. Only when the Shared disk of the second instance is mounted again after umount can you see it.

  Environment
  ===========
  1.openstack-Rcoky
  2.The volume type is ceph storage
  3.Shared disk cache=none
  <driver name='qemu' type='raw' cache='none' discard='unmap'/>

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