RE: I/O and db_file_multiblock_read_count

I would have never though a write to /dev/zero would work...I learn
something new every day.
Can you try this test writing to /dev/null?


________________________________

        From: Jesse, Rich [mailto:Rich.Jesse@xxxxxx] 
        Sent: Tuesday, December 12, 2006 7:16 AM
        To: kevinc@xxxxxxxxxxxxx; oracle-l
        Subject: RE: I/O and db_file_multiblock_read_count
        
        
        I'm guessing that I'm limited by CPU on this IBM JS21 blade's
LPAR (MPV, 2 cores max) with an SVC (virtualized SAN) backend.  topas
showed kernel mode CPU >95% for most of the tests.
         
        /oracle $ time dd if=S.dbf of=/dev/zero bs=1024k
        16384+1 records in
        16384+1 records out
         
        real    1m3.044s
        user    0m0.271s
        sys     0m42.458s
        
        /oracle $ time dd if=S.dbf of=/dev/zero bs=1024k
        16384+1 records in

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