Re: [openstack-dev] [Nova] Adding a xenapi_max_ephemeral_disk_size_gb flag
Hi, I guess, the splitting point is defined by the hypervisor, so I guess that's a +1 for the config option. Does any other hypervisor have such a limit? If so, it would make sense to set it to the minimum of all those limits. Mate On Thu, Jun 20, 2013 at 06:02:44PM +0100, John Garbutt wrote: Hi, I have had some discussions about if I should add a config flag in this change: https://review.openstack.org/#/c/32760/ I am looking to support adding a large amount of ephemeral disk space to a VM, but the VHD format has a limit of around 2TB per disk. To work around this in XenServer, I plan to add several smaller disks to make up the full ephemeral disk space. To me it seems worth adding a configuration flag (in this case), because there is no easy way to guess the correct value, and there doesn't seem to be a great value to hardcode it to. Having said that, I suspect the default value will be all most people need, whether or not they have very large ephemeral disk space in their flavors. I am curious about what people think (in general, and in this case) about the tradeoff between: hardcode, magic heuristic calculation, add config John ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev -- Mate Lakat ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
Re: [openstack-dev] [Nova] Adding a xenapi_max_ephemeral_disk_size_gb flag
On 06/21/2013 05:55 AM, John Garbutt wrote: Its just that the limit you want to set varies depending on the flavor. So flavor = 10TB, limit = 2000GB, the final disk is a bit of an odd size, maybe 1024GB would be a better split. Although you make a good point, maybe we should set the splitting point in extra specs in the flavor, rather than a config value. Sounds like it, if it's flavor specific anyway. -- Russell Bryant ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
Re: [openstack-dev] [Nova] Adding a xenapi_max_ephemeral_disk_size_gb flag
So in the current review, I have just gone for switching between 2000GB and 1024 GB. I figure we can try this simpler approach, and worry about generalizing it if people need it later. John On 24 June 2013 16:13, Russell Bryant rbry...@redhat.com wrote: On 06/21/2013 05:55 AM, John Garbutt wrote: Its just that the limit you want to set varies depending on the flavor. So flavor = 10TB, limit = 2000GB, the final disk is a bit of an odd size, maybe 1024GB would be a better split. Although you make a good point, maybe we should set the splitting point in extra specs in the flavor, rather than a config value. Sounds like it, if it's flavor specific anyway. -- Russell Bryant ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
[openstack-dev] [Nova] Adding a xenapi_max_ephemeral_disk_size_gb flag
Hi, I have had some discussions about if I should add a config flag in this change: https://review.openstack.org/#/c/32760/ I am looking to support adding a large amount of ephemeral disk space to a VM, but the VHD format has a limit of around 2TB per disk. To work around this in XenServer, I plan to add several smaller disks to make up the full ephemeral disk space. To me it seems worth adding a configuration flag (in this case), because there is no easy way to guess the correct value, and there doesn't seem to be a great value to hardcode it to. Having said that, I suspect the default value will be all most people need, whether or not they have very large ephemeral disk space in their flavors. I am curious about what people think (in general, and in this case) about the tradeoff between: hardcode, magic heuristic calculation, add config John ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
