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From: Chambers Anne
O[/O=EXCHANGE/OU=ADMINGROUP1/CN=RECIPIENTS/CN=ANNE.CHAMBERS]
Sent: Thur 01/10/2009 5:18:46 PM (UTC)
To: Jenkins Gareth G
Subject: RE: Draft paper on Horizon Data Integrity
Section 2
You mention incremental sequence numbers in the audit section at the end, but could mention it earlier too, to make
clear that each message has a unique identifier which stays with it when it is replicated.
Each individual message has a checksum.
Not quite sure what you should be saying about CRC read failures. We aren't currently checking old event logs for these
when doing audit retrievals, and I don't want us landed with even more checks to make. If there are CRC errors, SMC
normally raise a call and we trash the messagestore and let it rebuild - but probably don't want to say that! But if we
don't say, with they ask?
Event logs - more than 18 months but not sure if it is 7 years.
3.1.1, 3.1.2 The user will get an AP message warning them that the last session ended in error, but it only tells them to
check AP transactions, not others.
3.1.3.1 If banking recovery is not completed immediately after the counter is replaced, this is reported on the banking
reconciliation reports and followed up.
From: Jenkins Gareth Gl
Sent: 01 October 2009 12:39
To: Hodgkinson Allan AJ; Worrell Jeremy; Chambers Anne O; Sweeting Jim; Bailey Chris
ec: Smith Latoya; Burton John
Subject: Draft paper on Horizon Data Integrity
All,
Jeremy has asked me to produce a paper on Horizon Data Integrity to support POL in refuting claims by Postmasters
that Horizon is causing money to be lost.
I've put together an initial draft. I've ignored the “front bits” for now and am currently looking for comments on the
technical aspects and in particular the comments in yellow.
<< File: xxxSECxxxyyyy.HorizonDataintegrity.doc >>
Also if anyone is aware of other material to feed in on this I would be grateful. I had a quick look through PVCS and a search
through the TED and found nothing useful there.
Note that this is NOT yet in a state to go to POL and once I’ve had feedback from all of you (and anyone else you think is
relevant), Jeremy needs to pass this through Commercial.
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We have a conf call with POL 4pm on Friday, so I’d appreciate any feedback by lunch time Friday (which is when I committed
to providing this to Jeremy).
Jeremy: Do you have any thoughts as to where this should be lodged in Dimensions. I assume we need to make this a formal
document, but if not, I’m happy to remove the “front bits”.
Regards
Gareth
Gareth Jenkins
Distinguished Engineer
Applications Architect
Royal Mail Group Account
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