Comment #12 on issue 695 by [email protected]: support kvm run-time
memory changes (ballooning)
https://code.google.com/p/ganeti/issues/detail?id=695
Other comments: it sounds from this ticket that what's wanted is a
setting for "the
amount of memory to allocate on instance startup" - but how would that
interact
with the current algorithm that picks a value between minmem and maxmem?
Does it
essentially become an override for maxmem for all automatic ballooning
operations?
like described above it think would be the best to see "minmem"
and "maxmem" only as the lower and upper limits for an running instance
between which the runtime memory of an instance could be changed.
and "memory" is used as startup memory allocation for an instance. thats
how it works for xen and kvm it think.
http://libvirt.org/formatdomain.html#elementsMemoryAllocation
http://wiki.xen.org/wiki/Xen_Configuration_File_Options#VARIABLES
what i do not know if there is any automatic memory ballooning implemented
in ganeti. but one case where automatic changing of runtime memory could be
needed is when an instance needs to be migrated to an node where not enough
memory is available. in this case minmem could be the lower limit to which
ganeti should be allowed to automatically reduce the instance
current/runtime memory.
maybe i miss something because i dont have the whole picture of ganetis
behavior but for me this makes the most sense.
Finally, I guess it would also be useful to have a way to see the
*actual* memory
allocated to the VM right now. This is similar to ticket #854, where the
poster
wants to be able to see the run-time values of parameters set in a
one-shot way
using gnt-instance start [-H/-B], which is different to the startup
values stored
against the instance.
yes. it think "gnt-instance list" should show the current memory of the
instance.
--
You received this message because this project is configured to send all
issue notifications to this address.
You may adjust your notification preferences at:
https://code.google.com/hosting/settings
