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IDS Forum

Re: HDR and ER Running Together

Posted By: Art Kagel
Date: Tuesday, 19 June 2012, at 9:53 a.m.

In Response To: Re: HDR and ER Running Together (Keith Simmons)

An alternative would be to use an RSS secondary for the
monitoring/feedback/reporting server. That would also allow you to upgrade
the RSS secondary to an HDR secondary if one of the HDR servers goes down.

Art

Art S. Kagel
Advanced DataTools (www.advancedatatools.com)
Blog: http://informix-myview.blogspot.com/

Disclaimer: Please keep in mind that my own opinions are my own opinions
and do not reflect on my employer, Advanced DataTools, the IIUG, nor any
other organization with which I am associated either explicitly,
implicitly, or by inference. Neither do those opinions reflect those of
other individuals affiliated with any entity with which I am affiliated nor
those of the entities themselves.

On Tue, Jun 19, 2012 at 9:42 AM, Keith Simmons <smiley73@gmail.com> wrote:

> Thanks Madison,
>
> So am I correct in thinking that while HDR is stopped for any reason
> ER will also pause, regardless of whether HDR is in synchronous or
> asynchronous mode ?
>
> I'm trying to get my head around the implications of this.
>
> We use the target(s) of the ER as part of our monitoring and feed-
> back system and also as a read-only access for some customer
> facing web-pages to allow them to track orders in 'almost' real time.
>
> It would seem that if either the HDR Secondary or HDR Primary fail
> for any reason and require an extended portion of down-time (but
> not long enough to cycle the logs and require a complete re-
> instantiation of HDR) then we will not be able to maintain these
> targets in step. The alternative I think, therefore, is, during any failure
> likely to take more than 3-4 hours to resolve, to switch the remaining
> HDR server to stand- alone and then restart HDR using an archive/
> restore (not ideal for a 1Tb instance on each end of a 100 mile WAN
> link).
>
> Please can you confirm this reasoning and conclusion.
>
> Keith
>
> On 19 June 2012 13:38, Madison Pruet <mpruet@us.ibm.com> wrote:
> > If a replicated transaction is replicated via ER prior to ER knowing th=
> > at
> > it has made it to the HDR secondary, then there would be inconsistency =
> > in
> > the event of a failover. So we don't allow ER to replicate the transac=
> > tion
> > until we know that the secondary has the transaction.
> >
> > From: "Keith Simmons" <smiley73@gmail.com>
> > To: ids@iiug.org,
> > Date: 06/19/2012 02:58 AM
> > Subject: HDR and ER Running Together [27383]
> > Sent by: ids-bounces@iiug.org
> >
> > Lets try again, this may be easier to read !!
> >
> > Set up is as follows:
> >
> > IDS 9.4 on AIX 5.3 --> ER over LAN --> IDS 10 on Solaris 2.8
> > | |->
> > IDS 11 on Solaris 2.10
> > V
> > Sync HDR over WAN
> > |
> > V
> > IDS 9.4 on AIX 5.3
> >
> > Note ER is Primary to Secondary (one way).
> >
> > With this setup I am seeing lines in the error log of the HDR/ER
> > Primary as follows:
> > ER can not send replicated transactions due to HDR hang
> > ER resume transmission of ER/HDR replicated transactions
> > Also a few days ago the HDR secondary lost contact with the primary
> > and couldn't automatically re-establish (brief network glitch). I stopp=
> > ed
> > and restarted the secondary and this HDR re-established, but while
> > HDR was not running (and until the logs had shipped and applied up
> > to date) ER was frozen.
> > I am trying to understand why ER keeps stopping (albeit briefly) and
> > will not run while HDR is not connected. My suspicion is that it is rel=
> > ated
> >
> > to the fact I have HDR in Synchronous mode but would like this
> > confirmed. Also, if this is the case, is it possible to switch between
> > Synchronous and Asynchronous modes without restarting instances ?
> >
> > Many Thanks in anticipation
> >
> > Keith
> >
> > ***********************************************************************=
> > ********
> >
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> > =
> >
> >
> >
>
> *******************************************************************************
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

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