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-
-colo: Can not  recover colo after svm failover twice
-
-Hi Expert,
-x-blockdev-change met some error, during testing colo
-
-Host os:
-CentOS Linux release 7.6.1810 (Core)
-
-Reproduce steps:
-1. create colo vm following https://github.com/qemu/qemu/blob/master/docs/COLO-FT.txt
-2. kill secondary vm and remove the nbd child from the quorum to wait for recover
-  type those commands on primary vm console:
-  { 'execute': 'x-blockdev-change', 'arguments': {'parent': 'colo-disk0', 'child': 'children.1'}}
-  { 'execute': 'human-monitor-command','arguments': {'command-line': 'drive_del replication0'}}
-  { 'execute': 'x-colo-lost-heartbeat'}
-3. recover colo
-4. kill secondary vm again after recover colo and type same commands as step 2:
-  { 'execute': 'x-blockdev-change', 'arguments': {'parent': 'colo-disk0', 'child': 'children.1'}}
-  { 'execute': 'human-monitor-command','arguments': {'command-line': 'drive_del replication0'}}
-  { 'execute': 'x-colo-lost-heartbeat'}
-  but the first command got error
-  { 'execute': 'x-blockdev-change', 'arguments': {'parent': 'colo-disk0', 'child': 'children.1'}}
-{"error": {"class": "GenericError", "desc": "Node 'colo-disk0' does not have child 'children.1'"}}
-
-according to https://www.qemu.org/docs/master/qemu-qmp-ref.html
-Command: x-blockdev-change
-Dynamically reconfigure the block driver state graph. It can be used to add, remove, insert or replace a graph node. Currently only the Quorum driver implements this feature to add or remove its child. This is useful to fix a broken quorum child.
-
-It seems x-blockdev-change not worked as expected.
-
-Thanks.
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