Back up data files on bare Devices

Back up data files on bare devices 1. using dd is the fastest method to accomplis h this. however, it isnecessary 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 overwriteinform ation necessary for the operating system. the information onhow many blocks to skip is different on differe nt platforms. note that the number of data blocks to be skipped varies with OS.

# Dd if =/dev/raw/raw1 of =/u01/oradata/test_ts.dbf 'bs = 16 K (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>}