Re: Mutliplexing control/redo files

multplexing (control files and redo) will help only when there are separate
hard disks.
if its a same storage then multiplesing is not required instead I will
prefer regular backup, trace of control file etc.

thanks..subodh

On 6 October 2010 19:32, Storey, Robert (DCSO)
<RStorey@xxxxxxxxxxxxxxxxxx>wrote:

>  When I got into Oracle, the big thing was to have multiple physical disks
> so that you could multpliex your control and redo files on several different
> physical disks.  You would also put data files on separate disks/raids than
> your idx files.  Oracle went so far as to outline which raid types were best
> for which file types . I built a few systems on this principle and they all
> worked fine
>
>
>
> Then, in the last 5 or so years, Oracle comes out and says SAME is the way
> to go.  So, I built my latest (3 yrs old) box using just that. 6 physical
> disks setup as 3 mirrored pairs, and then stripped across. I created several
> logical volumes within that pool and followed my same principle of
> separating data and idx, and putting copies of each control/redo into
> different logical volumes.  Sorry, I’m in a Windows environment.
>
>
>
> But, as I am building my replacement box we are going to be moving to a SAN
> environment.   So, this begs the question of multiplexing within a SAME or
> SAN environment and does it still protect us in the way we envision?  It
> would seem to me now that there is no need to create separate logical
> volumes anymore.  Those tend to just be a helpful way of organizing the data
> into easily remembered folders.
>
>
>
> What should be my guiding principle for using the SANS.  If I just create
> one large LUN, give it a volume designator (D:/) and store everything within
> that volume, including multiple copies of control/redo,  is that not the
> same thing as the S.A.M.E principle?  Even if I create multiple LUNS, give
> each LUN a volume lable, and store my files accordingly, those luns are
> still just chunks out of the same group of disks.
>
>
>
> Does having a multiplex control file, with copies in separate folders any
> different that having copies all in the same folder?
>
>
>
> Just curious as to where to direct my hardware folks.
>
>
>
> Thanks
>



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