Why don't we keep Oracle Database ARCH logs in RAW devices

Hi All,
Why don't we keep Oracle Database ARCH logs in RAW devices?
How ARCH process is related to Block Device and Character Device ?
Thanks,
Tusar
Edited by: user11987718 on 26-Jun-2012 09:59

Why don't we keep Oracle Database ARCH logs in RAW devices? 1.This is because raw devices do not enable sequential writing of consecutive archive log files.
http://docs.oracle.com/cd/E11882_01/rac.112/e16795/rman.htm#RACAD320
2.with raw you have to specify the exact size of the file at creation time, in contrast with file system, where you can create file without specifying its size, start writing to it, apending new blocks to it until you are done, and thus creating a file of whatever size it needs to be to hold all information.
http://www.dbasupport.com/forums/archive/index.php/t-16429.html
3.raw file systems are difficult to manage because you cannot run normal os commands on them.(as there is no file systems)
How ARCH process is related to Block Device and Character Device ?A block device would read/write bytes in fixed size blocks, as in disk sectors. Character devices read/write 0 or more bytes, in a stream, such as a TTY or a keyboard.
For more details about what is block and character device type :
http://en.wikipedia.org/wiki/Device_file
And now think, how arch process is related to block and character devices.
Regards
Girish Sharma

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