Hi Dmitri,
This depends on so many factors that only you yourself can answer this. Your VM
density all depends on the spec of your hardware, your overprovisioning of
RAM/CPU and also very much on what size and workloads your VMs run and how much
disk activity they have. When you on top of this make CloudStack management
compete for resources with KVM on the same box then sooner or later one of your
resources will start to run low – in your case it’s impossible to say without
looking at the performance stats on your server – it could be CPU, RAM or disk
I/O. A density of 450 VMs / server is not something we see often – I guess
theoretically this could be achieved on light workloads and high spec servers –
but most CloudStack users will run with lower figures than this.
Transactions from secondary storage to primary storage: in short the first time
a template is used it is copied by the hypervisor from secondary (where it was
uploaded to) to primary. The second time it is used CloudStack checks if the
template is already in the chosen primary pool and if it is just uses the
existing copy for linked clone. The Secondary Storage VM is mainly there to
handle uploads and downloads to secondary storage as well as some snapshot
operations.
Hope this helps,
Regards,
Dag Sonstebo
Cloud Architect
ShapeBlue
On 05/07/2018, 08:46, "Dmitry Berezhnoy" <d.berezh...@emzior.ru> wrote:
Hello,
I have installed cloudstack-management, cloudstack-agent(KVM hypervisor)
and nfs-server at the same physical server. Then I have created virtual
machines one by one in 8 parallel threads. For each thread I created shared
network(VR). This server has two SSDs with ZFS filesystem. Copying files
and disk speed is good enough (not only in system idle), but when I have
450 virtual machines the next one has been creating during 5 minutes, is it
correct work? This time becomes too long on 200 (about a minute) virtual
machines and increase on every 10 machines or so. Does anybody have any
ideas how to make it faster?
Here is another question: how transaction from secondary storage to primary
works. I see that images on primary are something like delta from original
image (deduplicated?). Which component of Cloudstack is responsible for
transfering data from secondary to primary?
Thanks in advance for any ideas and info.
Best regards,
Dmitry
dag.sonst...@shapeblue.com
www.shapeblue.com
53 Chandos Place, Covent Garden, London WC2N 4HSUK
@shapeblue
