截止目前，ZDLRA 最新的版本是X7。ZDLRA和Exadata的关系非同一般，硬件是一样的，安装的数据库也是一样的，只是对数据库的一些功能做了限制，但对备份Oracle来说绰绰有余。ZDLRA的最低配置包含了两个计算节点和三个存储节点，计算节点不可以扩（一般来说2个节点足够了），单机架存储节点最多可以扩到个18个，最多可以扩到18个机架。
ZDLRA和Exadata的安装不完全一样，多了RA（Recovery Appliance）部分的配置、带库的配置以及远端ZDLRA的复制等，网络方面也不完全一样，这个要注意。更多细节可参考官方白皮书，官方的白皮书还是很给力的，很细致，只要你有足够的耐心和细心。所有的操作都可以通过EM来管理，非常直观和方便。
ZDLRA硬件对应的最低软件的版本
Hardware Required softwareZDLRA X7 Exadata System Software 18.1.0.0.0
ZDLRA X6 Exadata Storage Server 12.1.2.3.1
ZDLRA X5 Exadata Storage Server 12.1.2.1.0
ZDLRA X4 Exadata Storage Server 12.1.1.1.1
Overview & Feature
Information Center: Overview Zero Data Loss Recovery Appliance (Doc ID 1683791.2)
Zero Data Loss Recovery Appliance Features Available per Oracle Database Release (Doc ID 1995866.1)
Zero Data Loss Recovery Appliance Supported Versions (Doc ID 1927416.1)
HealthCheck
Zero Data Loss Recovery Appliance System Activity Script (Doc ID 2275176.1)
Oracle Exadata Database Machine exachk or HealthCheck (Doc ID 1070954.1)
Upgrade & Patch
Zero Data Loss Recovery Appliance Upgrade and Patching (Doc ID 2028931.1)
Zero Data Loss Recovery Appliance Critical Issues (Doc ID 1927928.1)
Troubleshooting
Information Center: Troubleshooting Oracle Zero Data Loss Recovery Appliance (Doc ID 1920712.2)
ZDLRA Detailed Troubleshooting Methodology (Doc ID 2066528.1)
Zero Data Loss Recovery Appliance Network Test Throughput script (Doc ID 2022086.1)
Zero Data Loss Recovery Appliance System Activity Script (Doc ID 2275176.1)
SRDC - Zero Data Loss Recovery Appliance (ZDLRA) Data Collection (Doc ID 2154189.1)
Replica & TAPE
ZDLRA: OSB/TAPE INSTALL TASKS REQUIRED AFTER SYSTEM RESECURE (Doc ID 2088941.1)
Implementing a Dual Backup Strategy with Backups to Disk/Tape and RA (Doc ID ID 2154461.1, 2154471.1)
Reference
https://docs.oracle.com/cd/E55822_01/index.htm
http://www.oracle.com/technetwork/database/availability/oracle-zdlra-backup-module-2279224.html
