ADSM-L

Re: ADSM Mirroring

1998-02-03 10:47:01
Subject: Re: ADSM Mirroring
From: "Sanders, David" <DSanders AT INTERNAL.MASSMUTUAL DOT COM>
Date: Tue, 3 Feb 1998 10:47:01 -0500
But I think I DO know (not to be cantakerous)), that a mirror process
should mirror the data.  I don't think that there would be any logical
manipulation of the data between the times of the double writes (and if
there is,,,,, that's a BAD thing),,,

> -----Original Message-----
> From: Richard Sims [SMTP:rbs AT BU DOT EDU]
> Sent: Tuesday, February 03, 1998 9:34 AM
> To:   ADSM-L AT VM.MARIST DOT EDU
> Subject:      Re: ADSM Mirroring
>
> >Mirroring is mirroring and you would hope that what is
> >written to mirror1 is the exact same as mirror2, since I wouldn't
> expect
> >the server to think/edit the data that it writes out secondly.
>
> But you're missing the point of what Eric and others have been
> saying...
> The closer mirroring is to the application creating the data, the
> better
> opportunity there is for error correction, via the server options.
> Hardware and operating system mirroring have no idea what's going on,
> data-wise, and cannot deal with logical errors.
> It is far better to avoid database problems than depend upon recovery
> to fix them.          Richard Sims, Boston University
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