Public bug reported:
Description
===========
On the live snapshot feature to have data consistency, the instance can be boot
with image property hw_qemu_guest_agent set to yes and QEMU agent install in
the image. The instance with local storage creates a disk mirror to have a copy
and the disk. With property hw_qemu_guest_agent the compute contacts the
instance to freeze the filesystem before starting the mirror and contacts the
instance again after the end of mirroring to unfreeze the filesystem. The issue
is for instance with a "big" disk the filesystem is frozen for a long time and
the impact is instance hung "task blocked for more than 120 seconds."
Steps to reproduce
==================
1/ Create an image with property hw_qemu_guest_agent=yes and QEMU agent install
in the image
2/ Create an instance with local storage (disk size 200Go) with real data on
the disk
3/ Start live-snapshot
4/ Instance frozen during the mirroring
Expected result
===============
Nova compute can wait until the end of mirroring to freeze the file system in
the instance.
Actual result
=============
The instance is frozen during the mirroring
** Affects: nova
Importance: Undecided
Assignee: Pierre Libeau (pierre-libeau)
Status: New
** Changed in: nova
Assignee: (unassigned) => Pierre Libeau (pierre-libeau)
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https://bugs.launchpad.net/bugs/1939116
Title:
File system freeze before end of mirroring generate kernel task
blocked for more than 120 seconds
Status in OpenStack Compute (nova):
New
Bug description:
Description
===========
On the live snapshot feature to have data consistency, the instance can be
boot with image property hw_qemu_guest_agent set to yes and QEMU agent install
in the image. The instance with local storage creates a disk mirror to have a
copy and the disk. With property hw_qemu_guest_agent the compute contacts the
instance to freeze the filesystem before starting the mirror and contacts the
instance again after the end of mirroring to unfreeze the filesystem. The issue
is for instance with a "big" disk the filesystem is frozen for a long time and
the impact is instance hung "task blocked for more than 120 seconds."
Steps to reproduce
==================
1/ Create an image with property hw_qemu_guest_agent=yes and QEMU agent
install in the image
2/ Create an instance with local storage (disk size 200Go) with real data on
the disk
3/ Start live-snapshot
4/ Instance frozen during the mirroring
Expected result
===============
Nova compute can wait until the end of mirroring to freeze the file system in
the instance.
Actual result
=============
The instance is frozen during the mirroring
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https://bugs.launchpad.net/nova/+bug/1939116/+subscriptions
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