Hi , I have 4 ignite servers 16C 32G . 
My server config in attachment.

Server config set the backups 1, I put 200G data to K-V data grid, The server 
will save 200G * 2 data .
Put data task complete,  I saw 52G backup file on disk in one node。


Why server can save all of data?  OR data is not whole??


Are there mechanisms for data discarding when there is not enough space?




 
<?xml version="1.0" encoding="UTF-8"?>

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  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
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  (the "License"); you may not use this file except in compliance with
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<!--
    Ignite Spring configuration file to startup Ignite cache.

    This file demonstrates how to configure cache using Spring. Provided cache
    will be created on node startup.

    Use this configuration file when running HTTP REST examples (see 'examples/rest' folder).

    When starting a standalone node, you need to execute the following command:
    {IGNITE_HOME}/bin/ignite.{bat|sh} examples/config/example-cache.xml

    When starting Ignite from Java IDE, pass path to this file to Ignition:
    Ignition.start("examples/config/example-cache.xml");
-->
<beans xmlns="http://www.springframework.org/schema/beans";
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd";>
    <bean id="ignite.cfg" class="org.apache.ignite.configuration.IgniteConfiguration">
        <property name="metricsLogFrequency" value="0" />
        <property name="peerClassLoadingEnabled" value="true"/>
        <property name="systemWorkerBlockedTimeout" value="#{60 * 1000}" />
        <property name="failureHandler">
            <bean class="org.apache.ignite.failure.StopNodeFailureHandler"/>
        </property>
        <!-- 数据配置区 -->
        <property name="dataStorageConfiguration">
            <bean class="org.apache.ignite.configuration.DataStorageConfiguration">
                <!-- Set concurrency level -->
                <property name="concurrencyLevel" value="4"/>
                <property name="pageSize" value="4096" />
                <property name="dataRegionConfigurations">
                    <list>
                        <!--
                            Defining a data region that will consume up to 500 MB of RAM and
                            will have eviction and persistence enabled.
                        -->
                        <bean class="org.apache.ignite.configuration.DataRegionConfiguration">
                            <!-- Custom region name. -->
                            <property name="name" value="package_region"/>

                            <!-- 100 MB initial size. -->
                            <!-- <property name="initialSize" value="#{24L * 1024 * 1024 * 1024}"/> -->

                            <!-- 500 MB maximum size. -->
                            <property name="maxSize" value="#{20L * 1024 * 1024 * 1024}"/>

                            <!-- Enabling persistence for the region. -->
                            <property name="persistenceEnabled" value="true"/>
                        </bean>
                    </list>
                </property>
            </bean>
        </property>

        <property name="cacheConfiguration">
            <list>
                <!-- Partitioned cache example configuration (Atomic mode). -->
                <bean class="org.apache.ignite.configuration.CacheConfiguration">
                    <property name="name" value="package_info"/>
                    <property name="atomicityMode" value="ATOMIC"/>
                    <property name="cacheMode" value="PARTITIONED" />
                    <property name="backups" value="1"/>
                    <property name="rebalanceMode" value="ASYNC" />
                    <property name="dataRegionName" value="package_region" />
                    <!-- <property name="onheapCacheEnabled" value="true" /> -->
                </bean>
            </list>
        </property>

        <!-- Explicitly configure TCP discovery SPI to provide list of initial nodes. -->
        <property name="discoverySpi">
            <bean class="org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi">
                <property name="ipFinder">
                    <!--
                        Ignite provides several options for automatic discovery that can be used
                        instead os static IP based discovery. For information on all options refer
                        to our documentation: http://apacheignite.readme.io/docs/cluster-config
                    -->
                    <!-- Uncomment static IP finder to enable static-based discovery of initial nodes. -->
                    <!--<bean class="org.apache.ignite.spi.discovery.tcp.ipfinder.vm.TcpDiscoveryVmIpFinder">-->
                    <bean class="org.apache.ignite.spi.discovery.tcp.ipfinder.vm.TcpDiscoveryVmIpFinder">
                        <property name="addresses">
                            <list>
                                <!-- In distributed environment, replace with actual host IP address. -->
                                <value>10.59.34.126:47500</value>
                                <value>10.59.24.178:47500</value>
                                <value>10.59.31.120:47500</value>
                                <value>10.59.22.231:47500</value>
                            </list>
                        </property>
                    </bean>
                </property>
            </bean>
        </property>
    </bean>
</beans>

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