A. It repairs blocks that have read disk I/O errors.
B. It checks whether the alias metadata directory and the file directory are linked correctly.
C. It repairs blocks by always reading them from the mirror copy and writing them to the original location.
D. It reads the blocks from a good copy of an ASM mirror and rewrites them to an alternate location on disk if the blocks on the original location cannot be read properly.
答案：（A、D）
解析：
参考《Automatic Storage Management Administrator's Guide》 remap命令
在磁盘上标志一定范围的块不可用并relocates在这个范围内分布的块
remap命令只是relocate块.它不会correct或repaire包含损坏内容的块.
这个命令使用的物理块大小由磁盘组属性SECTOR_SIZE决定
A选项感觉有些勉强