Ok, now I understand, so what do we need to get the power management configured and working?
Regards Jose ----- Mensagem original ----- De: "Shu Ming" <[email protected]> Para: "Tim Hildred" <[email protected]> Cc: [email protected] Enviadas: Segunda-feira, 18 de Março de 2013 5:18:28 Assunto: Re: [Users] High Availability Tim Hildred: >> If one host is down because of network interrupt or power >> failure, the engine should know how many HA VMs are down and find >> out the VM images on the storage domain to start the VM instances on >> another host in the cluster. Why do we need power manager to be >> configured? > Power management allows the Manager to start highly available virtual > machines on new hosts without worrying that virtual machine hard disk images > will be corrupted. > > Imagine a situation in which the Manager cannot communicate with the host a > highly available virtual machine is running on. If the host is still running > as expected, and the virtual machine is also still running, the virtual > machine is writing to its hard disk image. Tim, Thanks for clarification. That is what I expected. > > If the Manager starts that virtual machine on another host in the cluster, > then both virtual machine instances will try and write to the disk image, and > cause hard disk corruption. > > Power management lets the Manager be sure that only one instance of the > highly available virtual machine is running, because the instance on the host > the Manager couldn't communicate cannot survive a host reboot. > > Tim Hildred, RHCE > Content Author II - Engineering Content Services, Red Hat, Inc. > Brisbane, Australia > Email: [email protected] > Internal: 8588287 > Mobile: +61 4 666 25242 > IRC: thildred > > ----- Original Message ----- >> From: "Shu Ming" <[email protected]> >> To: "Tim Hildred" <[email protected]> >> Cc: [email protected], [email protected] >> Sent: Monday, March 18, 2013 1:31:12 PM >> Subject: Re: [Users] High Availability >> >> >> Tim, >> >> Thanks for your information. I am not sure why we need power >> management to be configured for the hosts running HA virtual >> machines. We only need a method to check the VM or host status and >> a method to restart the VM instances with existing VM images on >> another host. Is it required to force powering down the failing host >> forever to make sure the failing host will not come back to live >> again? >> >> >> >> >> * >> Power management must be configured for the hosts running the highly >> available virtual machines. >> * >> The host running the highly available virtual machine must be part of >> a cluster which has other available hosts. >> * >> The destination host must be running. >> * >> The source and destination host must have access to the data domain >> on which the virtual machine resides. >> * >> The source and destination host must have access to the same virtual >> networks and VLANs. >> * >> There must be enough CPUs on the destination host that are not in use >> to support the virtual machine's requirements. >> * >> There must be enough RAM on the destination host that is not in use >> to support the virtual machine's requirements. >> >> >> Tim Hildred: >> >> >> You might also find this helpful: >> https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Virtualization/3.1/html/Administration_Guide/High_availability_considerations.html >> >> The topics before and after it explain a bit more about high >> availability. >> >> Tim Hildred, RHCE >> Content Author II - Engineering Content Services, Red Hat, Inc. >> Brisbane, Australia >> Email: [email protected] Internal: 8588287 >> Mobile: +61 4 666 25242 >> IRC: thildred >> >> ----- Original Message ----- >> >> From: "Dafna Ron" <[email protected]> To: [email protected] Cc: >> [email protected] Sent: Monday, March 18, 2013 4:46:51 AM >> Subject: Re: [Users] High Availability >> >> I think that there is some confusion here so I will explain what are >> the >> configurations for fail-over. >> >> power management will reboot your host if a connectivity issue is >> detected so all your vm's will be killed. >> resilience policy will allow you to choose vm migration policy during >> a >> host failure and its configured in the cluster level (clusters -> >> select >> cluster -> general sub tab -> edit policy) >> High Availability is configured only for servers type vm's and what >> it >> does is re-run the vm in case the pid of the vm is killed (so most >> commonly, if you have power management configured, and the host is >> rebooted, the vm will start automatically on a different host). >> >> so it really depends what you want. if you want vm migration than >> look >> into cluster policy, if you want a specific vm to always be up and >> you >> don't care about the other vm's than configure power management and a >> HA >> vm. it really depends on what you need. >> >> >> >> >> On 03/17/2013 07:15 PM, [email protected] wrote: >> >> Is it Mandatory to have power manamement enabled? if yes what >> equipment do you recommend to use with it? >> >> Regards >> Jose >> >> >> ----- Mensagem original ----- >> De: "René Koch" <[email protected]> Para: [email protected] , >> [email protected] Enviadas: Domingo, 17 Março, 2013 16:47:41 >> Assunto: RE: [Users] High Availability >> >> Hi, >> >> You have to configure power management to make high availability >> working and mark the vms high availability checkbox... >> >> >> Regards, >> René >> >> >> -----Original message----- >> >> From:[email protected] <[email protected]> Sent: Sunday 17th >> March 2013 17:28 >> To: [email protected] Subject: [Users] High Availability >> >> What should I need to configure to put HA working? I mean, when a >> host broke all the VM automatically move to another host. >> Do I need to have Power management enabled? >> >> Thanks >> _______________________________________________ >> Users mailing list [email protected] >> http://lists.ovirt.org/mailman/listinfo/users >> _______________________________________________ >> Users mailing list [email protected] >> http://lists.ovirt.org/mailman/listinfo/users -- >> Dafna Ron >> _______________________________________________ >> Users mailing list [email protected] >> http://lists.ovirt.org/mailman/listinfo/users >> _______________________________________________ >> Users mailing list [email protected] >> http://lists.ovirt.org/mailman/listinfo/users >> >> -- >> --- >> 舒明 Shu Ming >> Open Virtualization Engineerning; CSTL, IBM Corp. >> Tel: 86-10-82451626 Tieline: 9051626 E-mail: [email protected] or >> [email protected] Address: 3/F Ring Building, ZhongGuanCun >> Software Park, Haidian District, Beijing 100193, PRC -- --- 舒明 Shu Ming Open Virtualization Engineerning; CSTL, IBM Corp. Tel: 86-10-82451626 Tieline: 9051626 E-mail: [email protected] or [email protected] Address: 3/F Ring Building, ZhongGuanCun Software Park, Haidian District, Beijing 100193, PRC _______________________________________________ Users mailing list [email protected] http://lists.ovirt.org/mailman/listinfo/users
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