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Re: SRDF and oracle

From: DA Morgan <>
Date: Sun, 16 Sep 2007 19:03:02 -0700
Message-ID: <>

hpuxrac wrote:

> On Sep 16, 5:35 pm, "KCS" <> wrote:

>> "hpuxrac" <> ha scritto nel
>>> On Sep 16, 9:42 am, "KCS" <> wrote:
>>>> Did somebody used the EMC technology called "SRDF" (SRDF/A) with oracle
>> for
>>>> a disaster recovery site ?
>>>> Let me know. From metalink the not synchronous modes does not seem to be
>>>> supported.
>>>> Bye
>>> Oracle supports SRDF both synchronous and asynchronous ...
>>> Sites using synchronous are "up to date" with all changes from the
>>> sending system. Where do you see the impact the most on an oracle
>>> system?
>>> Well it's in an event "log file synch". The impact of running in
>>> synchronous mode can be considerable ...
>>> In asynch mode the EMC syms ( or DMXs or clarions whatever ) keep
>>> track of things that have been changed but not yet propagated. They
>>> do preserve the order in which tracks that have been changed are sent
>>> across ... preserving the order is the crucial part that makes it a
>>> supported technology from the oracle side.
>>> In asynch mode you risk losing some small amount of things ( depending
>>> on available bandwidth and how fast redo log entries are being
>>> generated ) in a DR mode so this needs to be negotiated and
>>> understood.
>> The question is:
>> -EMC told us what you have just said, it works, the order in writing is
>> respected, ecc.
>> -Oracle says (contacted): we cant certificate asinchronous. (we have RAC an
>> ASM on source).
>> I think they do not want to have the responsabiluty and want us to use
>> Dataguard.
>> We do not want to find ourself in troble with the EMC solution but no oracle
>> support.
>> What do you think about ?
>> Thanx
> I think there a lot of people in oracle support giving out bad
> recommendations.
> I know RAC and EMC asynch is supported by both oracle and EMC.  Does
> ASM change that?  I don't think so but it's conceivable I guess ...
> you could ditch ASM perhaps.
> Do some more research on metalink and get someone more knowledgeable
> to work on your sr.

I'd ditch EMC before I'd ditch ASM.

EMC is losing customers out here on a regular basis as their Oracle support has been marginal at best. I know of two large corporations that have dropped them this year.

Daniel A. Morgan
University of Washington (replace x with u to respond)
Puget Sound Oracle Users Group
Received on Sun Sep 16 2007 - 21:03:02 CDT

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