+1 Some people think Cloud means 'magic' and failed physical instances should recover to the previous state. Most of the times this is not possible at app level, and I wonder if desirable.
Still, Nova lacks of features like 'HA' instances and instances running on remote block storage (like EBS backed instances in AWS).I think this is basic for self-healing features needed for real DR. Enviado desde mi iPad El 02/04/2011, a las 22:46, Jesse Andrews <[email protected]> escribió: > What to do when an instance dies is application specific. > > Some applications may not care, autoscaling back to the proper size by > themselves. Other applications may need the resources to be returned in the > most recent state. > > Currently openstack requires the user to handle recovery. > > I expect there will be an option to mark a virtual machine as "HA" which > would attempt to relaunch on crashes. How exactly to implement it will depend > on the cloud requirements. If the instances are backed to a SAN or > distributed filesystem (like ceph) the VM can be relaunched with all state > that has been flushed to disk. On a cloud with local disk only, the scheduled > snapshotting could allow the vm to a recent state. > > Or HA could mean relaunch the image (ala autoscale) > > What use case are you thinking about? > > Jesse > > On Apr 2, 2011 1:33 PM, "Marek Denis" <[email protected]> wrote: > > Hello, > > > > I have been trying to find out some info about features OpenStack > > provide and still cannot figure out whether 'cloud features' are > > available by default. By 'cloud features' I mean proper handling > > situations where we have many instances running on many different > > hardware servers. Suddently one server (physically) goes down, something > > bad happened. How will the OpenStack as a cloud behave by default? Will > > it run all the lost instances on other hardware servers or this should > > be specifically configured or programmed? How about data replication? > > Users shouldn't notice anything, as all the instances are ran in the > > cloud. Is it available by default? I couldn't find any docs that would > > explain these topics in a detailed way. Thanks for your explanation. > > -- > > regards > > > > M > > > > > > _______________________________________________ > > Mailing list: https://launchpad.net/~openstack > > Post to : [email protected] > > Unsubscribe : https://launchpad.net/~openstack > > More help : https://help.launchpad.net/ListHelp > _______________________________________________ > Mailing list: https://launchpad.net/~openstack > Post to : [email protected] > Unsubscribe : https://launchpad.net/~openstack > More help : https://help.launchpad.net/ListHelp
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