备份裸设备上的数据文件
1.Using dd is the fastest method to accomplis h this. However, it is
necessary to know how many blocks to skip in the raw device (e.g.,
on Tru64 UNI X you must skip 64 KB ) so that y ou do not overwrite
inform ation necessary for the operating system. The information on
how many blocks to skip is different on differe nt platforms.
注意需要跳过的数据块数量在不同os上是不同的
# dd if=/dev/raw/raw1 of=/u01/oradata/test_ts.dbf' bs=16K (Keep the Block size to multiple of thoracle账号e Oracle Block Size)2.From file system to raw device:RMAN> run { 2> allocate channel c1 type disk; 3> copy datafile ‘/u01/oradata/test_ts.dbf' to '/dev/raw/raw1'; 4> }From raw device to file sy stem: RMAN> run { 2> allocate channel c1 type disk; 3> copy datafile '/dev/raw/raw1' to '/u01/oradata/test_ts.dbf'; 4> }