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 the 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> }