Raw Disk access using clists???

[David Anderson]

> I have run Oracle Databases with Raw disk for production systems on heavily
> loaded systems.  I must warn you that Raw disk uses the same Clist buffer
> pool as terminals, and therefore your system must be appropriately tuned
> to maintain data integrity.

> UNIX systems are not very graceful about running out of system resources,
> so you should plan for this requirement in advance.  Large blocks of data
> moving to/from the Raw disk will steal Clist buffers at a much faster rate
> than any terminal with typical flow control settings.  This means that your
> seemingly abundant buffer pool could dwindle at a fantastic rate.

>					Martin Zam
>					(201)564-2554

   Although I'm not doubting your veracity, I've never seen an os/physio.c 
   (and subsequently any raw disk driver to which it passes its buffer pointer)
   that uses clists for raw disk access.  What flavor of UNIX are you running?

==============================================================================
  Dave Anderson                     
  Bull HN Information Systems       anderson at mips2.cr.bull.com
  300 Concord Road.
  Billerica, MA 01821               508-294-3253
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