Hi,
With regards to CF, if the failure where not a DASD failure but rather a
CF failure. Given CF are at each site, and we're recommended not to
duplex. How or under what conditions are we suppose to do CF duplexing ?
Looks like high availability parallel sysplex CF duplexing is broken
when we go geoplex ?
>You must have a CF at each site. In a fail-over situation, the DASD will be
>consistent. The reason that CF duplexing is not (yet) allowed, is that the
>structure contents may be ahead of the DASD when the freeze takes place.
>The DASD I/O is set to long busy in a freeze situation, but that is not the
>case with the CF I/Os.
>
>The current correct manner is to rebuild the structures. I have seen a
>reference to DB2 and multi-site data sharing. Someone with DB2 knowledge
>will have to take it from here.
After the short discussion which followed with regards to mirroring I
now have a new question
Asynchronous Cascading PPRC
----------- ----------- ----------- -----------
| PPRC pri| PPRC SYNC | PPRC sec| PPRC-XD | XD sec | |FlashCopy|
| |----------->| + |---------->| |-->| |
| A| | XD pri B| | C| | D|
----------- ----------- ----------- -----------
Hyperswap
With Asynchronous Cascading PPRC (PPRC v2), a volume is allowed to be
simultaneously both a PPRC primary and a PPRC secondary, combining three
volumes in two PPRC pairs. A periodic flashcopy is done to create a
consistent PIT backup from the otherwise fuzzy copy,
My question is this
1) If there is a outage in disk A, it is my understanding there will be a
FREEZE to ensure group consistency, and GDPS Hyperswap failsover makes
disk B the primary. Since only disk A is affected, does the asynch
mirroring to disk 3 then continue ? how about during fallback from B to A ?
2) If a disaster destroys both disk A and disk B, and a DR restart is
required at remove site using disk C. How does one fallback to using
disk A. I'm assuming a disruptive resync (catch-up) so that disk B,A can
become fully synchronizedwith disk C. Is this by any chance also handled
within the GDPS scripts.
Regards,
Yi Ming
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