[Users] Can host hooks be used to implement the following policy to avoid "boot storm"?
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.
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. _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
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?
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@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. ______________________________**_________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/**mailman/listinfo/users<http://lists.ovirt.org/mailman/listinfo/users>
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?
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. _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
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? yes at RunVmCommandBase.delay(Guid vdsId) - but it doesn't fit here. It'll delay the VM run only when there is no free memory to run the VM and will wait till engine signals after gathering statistics of
On 05/24/2013 03:22 PM, Itamar Heim wrote: powering up VMs.
On 05/26/2013 09:59 AM, Roy Golan wrote:
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. _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
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? yes at RunVmCommandBase.delay(Guid vdsId) - but it doesn't fit here. It'll delay the VM run only when there is no free memory to run the VM and will wait till engine signals after gathering statistics of
On 05/24/2013 03:22 PM, Itamar Heim wrote: powering up VMs.
lofyer - any other issue other than memory bottleneck you were trying to resolve? Thanks, Itamar
On 05/26/2013 09:59 AM, Roy Golan wrote:
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. _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
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? yes at RunVmCommandBase.delay(Guid vdsId) - but it doesn't fit here. It'll delay the VM run only when there is no free memory to run the VM and will wait till engine signals after gathering statistics of
On 05/24/2013 03:22 PM, Itamar Heim wrote: powering up VMs.
lofyer - any other issue other than memory bottleneck you were trying to resolve?
Thanks, Itamar I think only cpu_load here. If I start 8 VMs(1G memory each) in a 16G host, it will be very slow for VMs to enter the desktop mode from the time I click "start". At first I thought it would be a resolution if I put these boot
于 2013/5/26 15:41, Itamar Heim 写道: processes into a linear squence or delay a random period by using hooks. Is there an option that I can choose to arrange the boot squence in the engine? However, since each VM takes quite a long time to startup, there is no need to do that. Just plug in more CPUs......
于 2013/5/26 18:36, lofyer 写道:
On 05/26/2013 09:59 AM, Roy Golan wrote:
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. _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
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? yes at RunVmCommandBase.delay(Guid vdsId) - but it doesn't fit here. It'll delay the VM run only when there is no free memory to run the VM and will wait till engine signals after gathering statistics of
On 05/24/2013 03:22 PM, Itamar Heim wrote: powering up VMs.
lofyer - any other issue other than memory bottleneck you were trying to resolve?
Thanks, Itamar I think only cpu_load here. If I start 8 VMs(1G memory each) in a 16G host, it will be very slow for VMs to enter the desktop mode from the time I click "start". At first I thought it would be a resolution if I put these boot
于 2013/5/26 15:41, Itamar Heim 写道: processes into a linear squence or delay a random period by using hooks. Is there an option that I can choose to arrange the boot squence in the engine? However, since each VM takes quite a long time to startup, there is no need to do that. Just plug in more CPUs...... Knowing that some other factors will affect it, can I use an SSD as a "boot cache"?
On 05/26/2013 01:43 PM, lofyer wrote:
于 2013/5/26 18:36, lofyer 写道:
On 05/26/2013 09:59 AM, Roy Golan wrote:
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. _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
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? yes at RunVmCommandBase.delay(Guid vdsId) - but it doesn't fit here. It'll delay the VM run only when there is no free memory to run the VM and will wait till engine signals after gathering statistics of
On 05/24/2013 03:22 PM, Itamar Heim wrote: powering up VMs.
lofyer - any other issue other than memory bottleneck you were trying to resolve?
Thanks, Itamar I think only cpu_load here. If I start 8 VMs(1G memory each) in a 16G host, it will be very slow for VMs to enter the desktop mode from the time I click "start". At first I thought it would be a resolution if I put these boot
于 2013/5/26 15:41, Itamar Heim 写道: processes into a linear squence or delay a random period by using hooks. Is there an option that I can choose to arrange the boot squence in the engine? However, since each VM takes quite a long time to startup, there is no need to do that. Just plug in more CPUs...... Knowing that some other factors will affect it, can I use an SSD as a "boot cache"?
not sure, worth trying out i guess
participants (4)
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Itamar Heim -
lof yer -
lofyer
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Roy Golan