Alex, Sorry for the late reply. Been travelling the last couple of weeks. I'll look into this today.
--Alex From: Alex Ough [mailto:alex.o...@sungard.com] Sent: Monday, November 18, 2013 6:17 AM To: dev@cloudstack.apache.org Cc: Alex Huang Subject: Re: A question on vm migrations when hosts are set into a maintenance mode. Thank Parasanna & Sebastien, I also got his email and sent an email. Waiting for his reply... Thanks Alex Ough On Sat, Nov 16, 2013 at 3:05 PM, Sebastien Goasguen <run...@gmail.com<mailto:run...@gmail.com>> wrote: cc Alex Huang to get his attention: On Nov 15, 2013, at 10:17 PM, Prasanna Santhanam <t...@apache.org<mailto:t...@apache.org>> wrote: > Alex, Could you just do a git blame on the file and copy the emails of > people who changed that bit of code? They may be able to help if Cc-ed > directly. > > Thanks, > > On Fri, Nov 15, 2013 at 01:49:07PM -0600, Alex Ough wrote: >> I hate to sending the same emails over and over again, but I really need to >> finalize this feature to be included in the next code freeze because this >> feature is very critical in our inside project. >> >> Anyone who can help, please? >> Thanks >> Alex Ough >> >> >> On Thu, Nov 14, 2013 at 1:27 PM, Alex Ough >> <alex.o...@sungard.com<mailto:alex.o...@sungard.com>> wrote: >> >>> Not sure if Alex Huang checked this, but can anyone help to resolve this? >>> >>> Thanks >>> Alex Ough >>> >>> >>> On Wed, Nov 13, 2013 at 11:39 AM, Alex Ough >>> <alex.o...@sungard.com<mailto:alex.o...@sungard.com>> wrote: >>> >>>> It sounds a little scary... >>>> >>>> I looked at the history and found these. >>>> >>>> 8/9/ : file moved to engine by Alex Huang >>>> 9/16 : '_mgmtServer.getExecuteInSequence()' changed to >>>> 'getExecuteInSequence()' by Alex Huang >>>> >>>> >>>> Hi Alex Huang, >>>> I'm not sure if you're aware of this, but can you check this for me? >>>> >>>> Thanks >>>> Alex Ough >>>> >>>> >>>> >>>> On Wed, Nov 13, 2013 at 11:18 AM, Marcus Sorensen >>>> <shadow...@gmail.com<mailto:shadow...@gmail.com>>wrote: >>>> >>>>> I'm not sure. I know in the past when I've seen files change locations >>>>> it has also clobbered updates to that file. Someone branched, did the >>>>> reorganization work, and merged, while in-between the original file >>>>> changed. >>>>> >>>>> On Wed, Nov 13, 2013 at 9:21 AM, Alex Ough >>>>> <alex.o...@sungard.com<mailto:alex.o...@sungard.com>> >>>>> wrote: >>>>>> All, >>>>>> >>>>>> While merging my changes to 4.3 branch, I found that the option, >>>>>> 'execute.in.sequence.hypervisor.commands' is NOT used in >>>>> Start/Stop/Copy >>>>>> commands in 'VirtualMachineManagerImpl.java' any more as below. >>>>>> >>>>>> >>>>>> *StopCommand stop = new StopCommand(vm, getExecuteInSequence());* >>>>>> >>>>>> *protected boolean getExecuteInSequence() {* >>>>>> * return false;* >>>>>> *}* >>>>>> >>>>>> As you see in the above, the function, 'getExecuteInSequence', just >>>>> returns >>>>>> false instead of getting the value from the global variable. >>>>>> >>>>>> And one more change is that the file has been moved to >>>>>> 'engine/orchestration/src/com/cloud/vm' from 'server/src/com/cloud/vm'. >>>>>> >>>>>> Am I missing something related with this or do we stop supporting this >>>>>> option in 4.3? >>>>>> I'm a little confused, so please help me resolve this. >>>>>> >>>>>> Thanks >>>>>> Alex Ough >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> On Tue, Nov 12, 2013 at 4:20 PM, Alex Ough >>>>>> <alex.o...@sungard.com<mailto:alex.o...@sungard.com>> >>>>> wrote: >>>>>> >>>>>>> Thanks a lot for your confirmation, Marcus. >>>>>>> I'll create a review request unless anyone has an objection. >>>>>>> >>>>>>> Thanks >>>>>>> Alex Ough >>>>>>> >>>>>>> >>>>>>> On Tue, Nov 12, 2013 at 3:37 PM, Marcus Sorensen >>>>>>> <shadow...@gmail.com<mailto:shadow...@gmail.com> >>>>>> wrote: >>>>>>> >>>>>>>> I have done parallel KVM migrations without issue, it's "supposed to >>>>>>>> work". Really I think it's in the same boat as parallel start/stop. >>>>> It >>>>>>>> should work, but the config option is there just in case. I think we >>>>>>>> should add it. >>>>>>>> >>>>>>>> On Thu, Oct 3, 2013 at 11:41 AM, Chip Childers >>>>>>>> <chip.child...@sungard.com<mailto:chip.child...@sungard.com>> wrote: >>>>>>>>> On Thu, Oct 03, 2013 at 11:44:46AM -0500, Alex Ough wrote: >>>>>>>>>> I'm not sure what else commands 'MigrateCommand' actually execute >>>>> in >>>>>>>>>> addition to 'Start/Stop/CopyCommand', but can we include >>>>>>>> 'MigrateCommand' >>>>>>>>>> if it consists of only those 3 commands? >>>>>>>>>> >>>>>>>>>> Thanks >>>>>>>>>> Alex Ough >>>>>>>>> >>>>>>>>> In the case of VMware, the migrate command is executed via the >>>>>>>>> MigrateVMTask that's part of the VMware SDK (see >>>>>>>>> >>>>> vmware-base/src/com/cloud/hypervisor/vmware/mo/VirtualMachineMO.java). >>>>>>>>> >>>>>>>>> For VMware, I know that vCenter will queue and process concurrent >>>>>>>>> requests for migrations. Specifically, it will throttle the >>>>> migrations >>>>>>>>> happening, based on it's internal concurrency constraints, but the >>>>> task >>>>>>>>> queue will still accept more connections. Obviously the risk are >>>>> the >>>>>>>>> VMware layer tasks timing out if it takes too long for the task >>>>> queue to >>>>>>>>> complete. >>>>>>>>> >>>>>>>>> As for XenServer, it's happening in what appears to be a similar >>>>> way >>>>>>>>> (although the source host is the target for the migration API >>>>> call). >>>>>>>>> >>>>>>>>> Check >>>>>>>>> >>>>>>>> >>>>> plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/CitrixResourceBase.java. >>>>>>>>> >>>>>>>>> I'm not familiar enough with XenServer's concurrency model for >>>>>>>>> migrations. Any experts know the answer to if it can handle >>>>> concurrency >>>>>>>>> in a stable way? >>>>>>>>> >>>>>>>>> With KVM, it's obviously executing via the agent. Similarly to >>>>>>>>> XenServer, I'm not familiar enough to know about concurrent >>>>> operations. >>>>>>>>> >>>>>>>>> So do the HV experts on the list have any opinions about XenServer >>>>> and >>>>>>>>> KVM migration concurrency? >>>>>>>>> >>>>>>>>> -chip >>>>>>>>> >>>>>>>>> >>>>>>>> >>>>>>>> >>>>>>> >>>>> >>>>> >>>> >>> > > -- > Prasanna., > > ------------------------ > Powered by BigRock.com >
