Re: [ovirt-devel] Storage in VDSM questions
Hi!
On Thu, Jun 23, 2016 at 9:51 AM, Liron Aravot <laravot(a)redhat.com> wrote:
3. What hsm.spmSchedule() method does?
>
Schedules a task to be executed as SPM (used to perform operation that
alter
the shared storage or data operations currently).
But SPM is a particular host. What does this method do, if it is called
not on SPM host? Returns error? Or somehow transfers the task to the SPM
host?
7. Why in HSM we are using vars.task.getSharedLock(STORAGE, sdUUID)
> sometimes instead of domain lock?
>
The task lock (which uses the resource manager) is used to acquire in
memory logical lock within the current host.
Theoretical example- you wouldn't want to attempt to delete a domain while
you create a volume on it.
But this lock works only inside the host. So, if some other host will try
to create a volume, this lock will not help. So what's
11. What methods dom.linkBCImage(imgPath, imgUUID) and
dom.unlinkBCImage(imgUUID) do?
Creates/Removes a symlink to a given image.
Where this symlink is located? What is its purpose?
Can you be a bit more specific in the question? I don't have much to add
12. What methods dom.activateVolumes(imgUUID, imgVolumes)
and
dom.deactivateImage(imgUUID) do?
over the method names.
I understand that it activates/deactivates volumes. But what does it mean?
What is an "active" volume and how does it differ from "inactive"?
Shmuel
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