If HW redundancy is all that matters then Ms-Clustering & Oracle fail
safe is what your customer needs. In terms of utilizing your "horse
power" that's a waist of a server is the stand by server is a passive
one (at least for oracle DB).
Once you loose the active machine the passive one will become active.
This is done automatically.

Oracle 9i RAC is much more intelligent as this is a true cluster where
both nodes are ACTIVE governed by Oracle cache fusion logic that will
take care for all SGA(s) to be synced. In term of "horse power" you
double your capacity and you can of course add/subtract nodes
dynamically.

Replication (A read write one) has its complexities and can not be
considered as High Availability solution.

Yoav

-----Original Message-----
From: scott t
[mailto:oracledba-ezmlmshield-x55417107.[Email address protected]
Sent: Wednesday, June 30, 2004 8:05 AM
To: LazyDBA Discussion
Subject: urgent ... regarding failsafe

Hi guys

last week i was in discussion with a client ,
so i got some req of the client .
- they have 2 ibm servers , now only one is up with oracle 9i db on it,
db size 25 gb only
- they need dat available on both server .
- if one server down other should be there , no manual switch over .
- if one goes other one ll be up ,(failsafe) like active passive
- physical conn b/n servers using optical fibre
.

frnds
to implement this kind of set up wat i have to choose

standby , replication , RAC , microsoft clustering ..
please help me abt this problem

which s the best method to implement

regards
scott



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