rajujith commented on code in PR #499: URL: https://github.com/apache/cloudstack-documentation/pull/499#discussion_r2084361463
########## source/adminguide/vm_volume_allocators.rst: ########## @@ -0,0 +1,79 @@ +.. Licensed to the Apache Software Foundation (ASF) under one + or more contributor license agreements. See the NOTICE file + distributed with this work for additional information# + regarding copyright ownership. The ASF licenses this file + to you under the Apache License, Version 2.0 (the + "License"); you may not use this file except in compliance + with the License. You may obtain a copy of the License at + http://www.apache.org/licenses/LICENSE-2.0 + Unless required by applicable law or agreed to in writing, + software distributed under the License is distributed on an + "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + KIND, either express or implied. See the License for the + specific language governing permissions and limitations + under the License. + + +VM and Volume Allocators +====================== + +Each Instance must be deployed in suitable deployment destination. Deployment destination is set of recommended resources that you can choose for deploying an instance. +A deployment planner provides the suitable deployment destination that is required for a instance. + +Allocators are used to figure out suitable host and storage pools for deploying the Instance: + +#. VM Allocator +#. Volume Allocator + + +VM Allocator +------------ + +VM allocator returns suitable hosts in the cluster where you can deploy the given instance. Various parameters e.g. CPU and +RAM capacity, current state of the host are considered to decide the host. + +VM allocator supports following algorithms to select a host in the cluster: + +.. cssclass:: table-striped table-bordered table-hover + +============================= ======================== +Algorithm Description +============================= ======================== +random Selects a host in the cluster randomly. +firstfit Selects the first available host in the cluster. +userdispersing Selects the host running least instances for the account, aims to spread out the instances belonging to a single user account. +userconcentratedpod_random Selects the host randomly aiming to keep all instances belonging to single user account in same pod. +userconcentratedpod_firstfit Selects the first suitable host from a pod running most instances for the user. +firstfitleastconsumed Selects the first host after sorting eligible hosts by least allocated resources (such as CPU or RAM). +============================= ======================== + +Use global configuration parameter: +**vm.allocation.algorithm** to specify the algorithm that the Allocator must use. By default it is configured to use "random" algorithm. + + +Volme Allocator +-------------- + +VOlume allocator returns suitable storage pools available in the cluster where volumes of the given instance can be created. Review Comment: Please check the 'Volume' case. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: dev-unsubscr...@cloudstack.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
