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Re: Filesystem vs. Raw IO
- From: Tanel Põder <tanel.poder.003@xxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 1 Jun 2004 12:06:48 +0300
> NetApp disk UFS filesystem: 48 sec
>
> NetApp disk raw space: 3 min 7 sec
>
>
>
> What should I be looking at? Why such a big difference?
What if you set your filesystemio_options to direct or setall in your UFS
configuration? That way filesystem buffering for read-ahead purposes won't
be used. Also set the db_file_multiblock_read_count to 1MB (128 for 8K
blocks) in both configurations - that way raw IO has more chance to compete.
Tanel.
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