Barbara Nitz wrote:
Even a complete disaster on the first test is a success, under the
covers. It will point out the flaws in the plan, and the items that are
missing.
To warm up (is that an English expression?) an old argument: The above *assumes* that it is a 'real' test, as in "Let's take down the system on the fly and see if it comes up again". I have seen this done once, and it really pointed out a lot of problems that we could then fix.
Unfortunately, the going practise is to "test DR" by doing an orderly shutdown first and then just re-IPL in the other location. In my opinion, this just tests that you defined hardware (and maybe some infrastructure in iplparm/loadxx/ieasysxx) correctly), but it is not a DR test.
There is another possibility: to "cut the wire" (remote copy link) and
have everything on remote site as the primary site would blown up.
However even such test is not "realistic enough". Reason: rolling
disaster. In real world your machines can be destroyed one after
another. The delta can be sometimes minutes, sometimes less than second,
however it is extremely important for data consistency.
My €0.02:
1. Data consistency!!!
2. DR is NOT EQUAL to "mainframe is up and ready". You (your business)
needs *complete solution*, possibly including small funny Windows/Linux
servers that we don't like and don't care. From my experience I could
say that having mainframe working on DR site is piece of cake, when
compared to the rest of infrastructure.
--
Radoslaw Skorupka
Lodz, Poland
--
BRE Bank SA
ul. Senatorska 18
00-950 Warszawa
www.brebank.pl
Sd Rejonowy dla m. st. Warszawy
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NIP: 526-021-50-88
Wedug stanu na dzie 01.01.2008 r. kapita zakadowy BRE Banku SA wynosi
118.642.672 zote i zosta w caoci wpacony.
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