Server resources
- Thread starter czdavid
- Start date
As long as not all Servers run on full load you won't have problems here.
Even when the worst case happens and every Container goes full rampage on the same time and uses every resource he has (or at least tries to use it), your server won't crash but everything will go slow as hell, or even be almost unresponsive.
So you can have this Containers without system crashes for sure, but whether you should is affected by what the Container are expected to do.
this post has some additional infos:
http://forum.proxmox.com/threads/11...can-run-on-a-4-cores-server?p=62859#post62859
Even when the worst case happens and every Container goes full rampage on the same time and uses every resource he has (or at least tries to use it), your server won't crash but everything will go slow as hell, or even be almost unresponsive.
So you can have this Containers without system crashes for sure, but whether you should is affected by what the Container are expected to do.
this post has some additional infos:
http://forum.proxmox.com/threads/11...can-run-on-a-4-cores-server?p=62859#post62859
The threads conclusion about RAM and KVM does not hold anymore due to the balloon driver in recent KVM. The balloon driver ensures that unused memory in every VM is returned to the shared pool of memory.
I think Udo means: this current thread is about having only Openvz, so KSM is not involved here.
to the OP: int the suggested thread I read "you should leave a couple of GB free for the host system. With OpenVZ, it can be much more."
so if your CTs (openvz) concurrently use even less than the maximum allowed ram amount, you'll run into troubles.
Maybe if you use VMs (kvm), insetead of CTs, (openvz) and using the same base OS, KSM will allow you to save some ram just start them with some delay... KSM needs some time to figure out which ram pages to share...
Marco
to the OP: int the suggested thread I read "you should leave a couple of GB free for the host system. With OpenVZ, it can be much more."
so if your CTs (openvz) concurrently use even less than the maximum allowed ram amount, you'll run into troubles.
Maybe if you use VMs (kvm), insetead of CTs, (openvz) and using the same base OS, KSM will allow you to save some ram just start them with some delay... KSM needs some time to figure out which ram pages to share...
Marco
With "With OpenVZ, it can be much more." he means that you can run much more than 5x 4GB VM's like in KVM not that OpenVZ needs more additional memory for teh host, thats the way I would understand it.
But the point that it's much better if you don't overbook your host machine and leave a bit additional resources to it, is a valid one.
mmm yes, reading again, that part could be more as you say.
But the point is openvz will not get any memory sharing help as kvm does, and the hyervisor needs memory of its own so, tak ealso that into account
Marco
But the point is openvz will not get any memory sharing help as kvm does, and the hyervisor needs memory of its own so, tak ealso that into account
Marco