Martin> Perhaps this is not the right topic, but I want to say a few
Martin> words to Oracle:
Martin> Oracle uses raw-devices, because they thought it was the
Martin> fastest solution. In the meantime they have support for
Martin> NetApp-Filers. So Oracle goes through the Net (may be private
Martin> for being faster) and then runs into the Cache of the
Martin> NetApp-Filer. So Oracle has no overhead for Filemanagement,
Martin> and can be faster so, and the Net-App-Filer is optimized for
Martin> Disk-IO and is thus faster.
Martin> The Bottleneck in this configuration is the net. But still
Martin> Oracle support this solution and say that it is indeed faster
Martin> than the Raw-Device solution if you have a fast net.
<advocate client=devil>
The difference between using the toaster as the backing store vs
Linux's page cache is that the former is `safe', in that, once the
data hit the toaster and are acked, the dbm knows that they are not in
danger of loss due to power failure. Were Linux's page cache
transaction based and routed through battery- backed nvram, the
comparison would be more valid.
In short, they want to be assured that the data made it to non-
volatile storage.
</advocate>
-JimC
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