Re: Re[2]: About parallel server

Dick, I am not sure which platform you where using for OPS, but you have to use raw device's. Unless you are using OpenVMS or Compaq TRU64 v5.1 you have to use raw devices for datafiles, controlfiles and online redo logs. Archive logs have to go to a file system. Now there are some unsupported things you can do to get Oracle datafiles on filesystems in an OPS environment but the key word here is unsupported.

Scott
> Brian,
>
> I was looking at parallel server for an application we were
> developing last year. In 8.1.6 at least the control and on-line redo
> (not rollback segment) files no longer had to be on raw devices. And I
> stand corrected, there is one and only one standard unix command that
> does work, dd. It's just such a pile of alphabet soup. That's why we
> hired a couple of top notch Unix admins. They handle it.
>
> Dick Goulet
> ---------------------- Reply Separator ----------------------
> Author: Brian MacLean <bmaclean_at_vcommerce.com>
> Date: 5/30/01 3:50 PM
>
> Your point 1:
>
> Unless things have changed redo and controlfiles must be raw. When I
> took
> the OPS course several years ago and worked with OPS we needed the
> redo/controlfiles to be on raw so that one instance could recover when
> another instance failed.
>
> Your point 5:
>
> The Unix command "dd" will do raw.
>
> -----Original Message-----
> Sent: Wednesday, May 30, 2001 3:48 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Fernando,
>
> Replies included in your original mail, but in addition:
>
> Parallel server is a separately priced option from Oracle and it is
> pricey.
> Second you may need specific software from you OS vendor to coordinate
> the
> file
> sharing between the servers, again an additional expense.
>
> Dick Goulet
>
> ____________________Reply Separator____________________
> Author: "Fernando Papa" <fpapa_at_elsitio.com.ar>
> Date: 5/30/2001 2:07 PM
>
>
> Hi everybody!
>
> I have some questions about parallel server. Now we have only one
> instance
> "stand-alone" (no parallel), but we are thinking to switch to parallel
> server because we have a couple of sparc 3500 and nobody are using it,
> and
> we think it's good for increase our processing power.
>
> The problem is I didn't work with parallel server and I have a lot of
> questions about it:
>
> 1) Is mandatory to use raw devices for control files, redo logs & data
> files?
> --> Data files yes, redo and control files can be on cooked file
> system.
>
> 2) How we transfer our cooked data files to raw devices data files?
> import/export? or exist another better (fast) method?
> --> To the best of my knowledge your going to have to rebuild the
> database
> from
> scratch so imp/exp is your only option.
>
> 3) If I start with only one node, performance will be the same of one
> single
> instance (no parallel)?
> --> Yes and NO, raw devices run a little faster than cooked files since
> the
> OS's
> buffer cache is not in the middle.
>
> 4) Somebody know how to work with raw devices under solaris? any link? I
> try
> to found someting in metalink but there's no samples...
> --> Working with raw devices is very different from cooked file systems.
> If
> you
> don't have an experienced Unix admin you could be in serious trouble.
>
> 5) What about backup? I can't put tablespaces in backup mode and copy
> with
> cp... maybe it's time to use rman?
> --> Rman can handle the backups, but a file system level backup is
> different.
> CP does not work anymore, nor does fbackup, or tar. You'll need
> specialized
> software for the purpose.
>
> Thanks in advance!
>
> --
> Fernando O. Papa
> DBA
> El Sitio - Infraestructura
> (54-11) 4339-3854
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Fernando Papa
> INET: fpapa_at_elsitio.com.ar
>
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