镜像文件名与对应的版本信息：
V921569-01.iso Oracle Linux Release 7 Update 4 for x86 (64 bit), 4.6 GB
V834394-01.iso Oracle Linux Release 7 Update 3 for x86 64 bit, 4.3 GB
V77200-01.iso Oracle Linux 6 Update 7 for x86 32 bit, 3.1 GB
V77197-01.iso Oracle Linux 6 Update 7 for x86 64 bit, 3.6 GB
网上搜索或官网下载 https://www.oracle.com/technetwork/server-storage/linux/downloads/index.html
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