[Users] Can host hooks be used to implement the following policy to avoid "boot storm"?

[lof yer]

Actually I was using a bash script works like semaphore in
before/after_vm_start. As a result that a parallel problem occured: four
vms read the same number at the same time, so I abandoned this way.
Now I just add a random delay period before vm start, not very well.


2013/5/24 Itamar Heim <iheim at redhat.com>

> On 05/23/2013 04:23 PM, lofyer wrote:
>
>> Can host hooks be used to implement the following policy to avoid "boot
>> storm"?
>>
>> 1.count and sort VMs awaiting for boot.
>> 2.If the count is less than or equal to, for example 5, then boot all
>> VMs and exit the script.
>> 3.Otherwise, boot and dequeue vm0 to vm4, and minus the count by 5.
>> 4.Sleep some time, and go to step 2.
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>
> hooks run one on vm-start one by one. would be a bit tricky to do the
> above.
> roy - didn't you add some mechanism to throttle boot storms in the engine?
>
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