可以的，在新集群的asm实例中mount旧的数据盘即可

mount失败：
SQL> alter diskgroup DATA mount;
alter diskgroup DATA mount
*
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15017: diskgroup “DATA” cannot be mounted
ORA-15063: ASM discovered an insufficient number of disks for diskgroup “DATA”

SQL> select group_number gn,disk_number dn, mount_status, header_status,mode_status,state, total_mb, free_mb, label, path from v$asm_disk order by group_number, disk_number;

GN DN MOUNT_S HEADER_STATU MODE_ST STATE TOTAL_MB FREE_MB LABEL PATH

0 0 CLOSED CANDIDATE ONLINE NORMAL 0 0 /dev/asm-data
1 0 CACHED MEMBER ONLINE NORMAL 1024 964 /dev/asm-diskb
1 1 CACHED MEMBER ONLINE NORMAL 1024 964 /dev/asm-diskc
1 2 CACHED MEMBER ONLINE NORMAL 1024 965 /dev/asm-diskd

SQL>

原来的环境中，+DATA这个DG中只有一块盘，都迁到新环境中来了

请检查这块盘的权限是否正确。