I think the lines are blurring slightly. It's not the responsibility of the infrastructure layer to ensure that the application layer self-heals after an unscheduled reboot.
I don't think that a HA feature should be left out because there are applications that may not heal, The discussion of infrastructure choice sits with the application administrator and not the infrastructure developer - you guys. The openstack team is making good ground, but there's a key 'cloud' function missing and its HA. On 03/04/2011, at 6:59 PM, Diego Parrilla wrote: > +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 > > _______________________________________________ > Mailing list: https://launchpad.net/~openstack > Post to : [email protected] > Unsubscribe : https://launchpad.net/~openstack > More help : https://help.launchpad.net/ListHelp Jacob Gardiner National Hosting Manager E [email protected] Squiz Pty. Ltd. A 92 Jarrett Street, Leichhardt NSW 2040 P +61 2 8507 9900 F +61 2 8507 9988 SUPPORT 13000 SQUIZ W www.squiz.com.au AUSTRALIA UNITED KINGDOM NEW ZEALAND EUROPE UNITED STATES SYDNEY MELBOURNE CANBERRA HOBART BRISBANE SUPPORTED OPEN SOURCE SOLUTIONS
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