W dniu 2018-07-10 o 06:56, Timothy Sipples pisze:
I should also respond to this part:
Radoslaw Skorupka wrote:
...for availability reasons one should avoid having CF
and z/OS LPAR on the same hardware, which means....
That's not phrased as IBM would phase it, and it's not correct as written.
Even when there's some merit in physically separating the CF, the physical
separation need only be between that CF and the particular z/OS Parallel
Sysplex it serves. Having other z/OS LPARs, even LPARs that are
participating in other Parallel Sysplexes, on the same machine as the CF is
consistent with IBM's recommendations here.
David Raften has published a whitepaper (updated in May, 2018) that
explains the various CF configuration options. The direct link to the
current edition is here:
https://public.dhe.ibm.com/common/ssi/ecm/zs/en/zsw01971usen/zsw01971usen-.pdf
[...]
I quickly browsed the document and found confirmation what I learned
several years ago.
That means:
Yes, you need either standalone CF (*see note) or CF structure
duplexing! This is required for *some* structures, but ...it is. David
Rften call it structures which /require failure independence/.
Note: Standalone CF should be understood here as LOGICAL stand alone CF.
IBM-MIAN do not allo pictures, so I'll try to describe it:
SYSPLEX PROD:
z/OS 1 in CPC A, z/OS 2 in CPC B, and CF2 in CPC B or A. And CF1 in CPC C.
Three CPCs.
However CPC C may be used for other purpose, i.e. for test LPARs.
Anything but z/OS image belonging to the sysplex PROD.
There is also two-CPC configuration
z/OS 1 + CF1 in CPC A, z/OS 2 + CF2 in CPC B and *some structures are
duplexed*.
What I heard unofficially from IBM-ers is such configuration is "budget"
read: when you cannot afford good one.
And the link between CFs should be really local (short).
Note2: it is also possible to build a configuration without dedicated
(logical stand alone) CF and without duplexing. Your choice.
However it is NOT resistant to all possible (single) failures. Yes, it
is still better than parallel sysplex with single CF, but still
vulnerable to some failures.
--
Radoslaw Skorupka
Lodz, Poland
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