Thanks Bharat. It would be nice if you can add an example in the FS [1], an example of calculation.
Say admin decides an overcommit ration for memory = 2. Similarly for cpu. What does it mean for the capacity of his cluster ? What does it mean when a vm gets deployed with service offering 1 gb What would the dashboard look like after the vm is deployed in the cluster. [1] https://cwiki.apache.org/confluence/display/CLOUDSTACK/CPU+and+RAM+Overcomm it Thanks, -Nitin On 22/08/13 11:33 AM, "Bharat Kumar" <bharat.ku...@citrix.com> wrote: >Hi Dinu, > >you can modify the system service offering for the systems vms and change >it to 512MB so that when using overcommit (of 4 ) its memory is set to >128 MB. > >you are right the current memory is set to system offering divided by the >over provisioning factor. > >On Aug 22, 2013, at 2:05 AM, Dinu Arateanu <dinu.arate...@gmail.com> > wrote: > >> Hello, >> >> I'm testing ACS 4.2 with kvm. I noticed that when one configures >>mem.overprovisioning.factor Global/Cluster setting, chances are that the >>System VMs configured with an offer of 128 MB RAM will never start >>(namely the Domain Router and the SSVM). >> >> According to the agent.log, ACS sends libvirt the request to start the >>VM with a "currentMemory" parameter equal to the System Offering RAM >>divided by mem.overprovisioning.factor: >> >> 2013-08-21 11:02:34,824 DEBUG [cloud.agent.Agent] >>(agentRequest-Handler-1:null) Request:Seq 1-1537935677: { Cmd , MgmtId: >>117981950658, via: 1, Ver: v1, Flags: 100011, >>[{"com.cloud.agent.api.StartCommand":{"vm":{"id":13,"name":" >> >>r-13-VM","type":"DomainRouter","cpus":1,"minSpeed":125,"maxSpeed":500,"mi >>nRam":33554432,"maxRam":134217728,"arch":"x86_64","os":"Debian GNU/Linux >>5.0 (32-bit)","bootArgs":" template=domP name=r-13-VM eth0ip=10.10.40.10 >>eth0mask= >> 255.255.255.0 gateway=10.10.40.1 domain=dev.int dhcprange=10.10.40.1 >>eth1ip=169.254.3.215 eth1mask=255.255.0.0 type=dhcpsrvr >>disable_rp_filter=true >>dns1=8.8.8.8","rebootOnCrash":false,"enableHA":true,"limitCpuUse":false >> >>,"enableDynamicallyScaleVm":false,"vncPassword":"*","params":{"memoryOver >>commitRatio":"4","cpuOvercommitRatio":"4"},"uuid":"52caa75a-5331-4979-945 >>6-18d1b743b7ad","disks":[{"data":{"org.apache.cloudstack.storage.to. >> >>VolumeObjectTO":{"uuid":"c84b6834-6bab-4087-a044-e61a1e3a391b","volumeTyp >>e":"ROOT","dataStore":{"org.apache.cloudstack.storage.to.PrimaryDataStore >>TO":{"uuid":"c1ac7425-f6d2-3ada-b78a-b17faceb89ea","id":2,"poolType":"RBD >>","host":" >> >>ceph.dev.int","path":"rbd1","port":6789}},"name":"ROOT-13","size":2729152 >>48,"path":"329df94f-4c30-4617-9fbd-440b76f08cde","volumeId":13,"vmName":" >>r-13-VM","accountId":1,"format":"RAW","id":13,"hypervisorType":"KVM"}},"d >>i >> >>skSeq":0,"type":"ROOT"}],"nics":[{"deviceId":0,"networkRateMbps":1000,"de >>faultNic":true,"uuid":"c68fdd00-68e0-4755-b6e1-c07c4d122040","ip":"10.10. >>40.10","netmask":"255.255.255.0","gateway":"10.10.40.1","mac":"06:f2:0e:0 >>0:01:74" >> >>,"dns1":"8.8.8.8","broadcastType":"Vlan","type":"Guest","broadcastUri":"v >>lan://40","isolationUri":"vlan://40","isSecurityGroupEnabled":false,"name >>":"vswitch0"},{"deviceId":1,"networkRateMbps":-1,"defaultNic":false,"uuid >>":"1778dbb >> >>d-7d27-481a-96ad-99c9aac36e8f","ip":"169.254.3.215","netmask":"255.255.0. >>0","gateway":"169.254.0.1","mac":"0e:00:a9:fe:03:d7","broadcastType":"Lin >>kLocal","type":"Control","isSecurityGroupEnabled":false}]},"hostIp":"10.1 >>0.8.25"," >> >>executeInSequence":false,"wait":0}},{"com.cloud.agent.api.check.CheckSshC >>ommand":{"ip":"169.254.3.215","port":3922,"interval":6,"retries":100,"nam >>e":"r-13-VM","wait":0}},{"com.cloud.agent.api.GetDomRVersionCmd":{"access >>Details":{ >> "router.name":"r-13-VM","router.ip":"169.254.3.215"},"wait":0}},{}] } >> [...] >> <name>r-13-VM</name> >> <uuid>52caa75a-5331-4979-9456-18d1b743b7ad</uuid> >> <description>Debian GNU/Linux 5.0 (32-bit)</description> >> [...] >> <memory>131072</memory> >> <currentMemory>32768</currentMemory> >> <devices> >> <memballoon model='virtio'/> >> </devices> >> <vcpu>1</vcpu> >> <os> >> <type arch='x86_64' machine='pc'>hvm</type> >> <boot dev='cdrom'/> >> <boot dev='hd'/> >> </os> >> <cputune> >> <shares>125</shares> >> </cputune> >> <on_reboot>restart</on_reboot> >> <on_poweroff>destroy</on_poweroff> >> <on_crash>destroy</on_crash> >> </domain> >> >> As a result, the System VM will be created, but will never run - 32 MB >>RAM is too low. I'm not arguing about how recommended it is to set a >>factor of 4 for memory ballooning (outside testing environments), but >>rather that ACS should start (at least the System) VMs with a minimum >>RAM. The virtio_balloon module seems to be loaded within the SVM >>template, but it does not work. >> >> Is there any way to control how much minimum RAM ACS allocates based on >>the service offering and the overprovisioning factor? >> >> Thanks, >> Dinu >> >> >> >
