Re: Oracle 9i RAC

Pete Sharman wrote:

>[snip]
 

> Depends on what you want to do. RAC will work whether you're using MSCS
> or not.
> FailSafe on the other hand requires MSCS. From what I understand,
> FailSafe is the active-standby solution,

Correct. One node does all the work, the other sits there waiting for an asteroid strike... at which point, it will leap into action. I may be muddying waters here, but I don''t consider that a "true" RAC (though Oracle itself certainly does, I guess).

MS Cluster Software prevents node 2 from accessing the 'shared' disk until node 1 gives up the ghost... so there's no possibility of true multi-node simultaneous access to the data. Hence the need to disable clustering services for all installations -though it's only done temporarily if you are then intending to go for a FailSafe-type solution.

Regards
HJR
>while RAC can be either
> active-standby or active-active, but as I mentioned before, RAC on Windows
> is not something I've played with in great detail so I could be wrong on
> that.
>
> Pete
>>
>>Point being, it's perfectly possible to RAC two Windows Pro boxes (and use
>>the CFS, even though the installation doco doesn't say that you can do so
>>on that version).
>>
>>When you install the CFS on node 1, incidentally, the relevant software
>>gets automatically copied across to node 2, and a service is started on
>>*both* nodes. So, no -there's no third machine, and it goes on both nodes
>>of the cluster, but *you* only have to physically install it on one.
>>
>>It makes RAC installation a doddle, since you only need a couple of
>>partitions to work with, instead of the bezillion you require with raw
>>devices. You get the opportunity to tell Oracle whether you want the CFS
>>to be used for the ORACLE_HOME, the datafiles, or both... in other words,
>>it makes possible the single installation of Oracle's executables onto the
>>shared drive... each node doesn't have to have it installed separately,
>>and installation time is therefore about halved. Frankly, it's a godsend.
>>
>>Regards
>>HJR
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>>
>>>> HTH. Additions and corrections welcome.
>>>>
>>>> Pete
>>>>
>>>> SELECT standard_disclaimer, witty_remark FROM company_requirements;
>>
>
> HTH. Additions and corrections welcome.
>
> Pete
>
> SELECT standard_disclaimer, witty_remark FROM company_requirements;
  Received on Wed Sep 04 2002 - 03:47:02 CDT