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October 19th, 2011 03:00
would like to know the calculation for RPO from the cycle time info for SRDF/A and SRDF/AR?
please let me know the relation b/wn the cycle time and RPO for replication.
for eg. if for SRDF/A cycel time is 30min then RPO is 60min? twice the cycle time?
pls answer..
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r_shankar
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December 29th, 2011 15:00
I guess the RPO will be 90 Minutes.
Not sure, Can anyone comment on it?
Regards,
Shankar R
SKT2
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January 22nd, 2012 15:00
SRDF/A works in cycle of four steps ( recieve the data, gather the data for the till the predefined cycle time, send the data, and wait for acknowledgments). in SRDF/A writes are destaged to disk only after they have been copied over the RDF links. In a given point of time there are one one "cycle switc "which is send over the rdf link and waiting for the ACK and the SAME time another cycle is doing "recieve the data and gathering data " . So if a failure ocurs during this stage you lose maximum two "cycle switches of data" one being waiting for the ACK and the other one being the "receive/gather" state. That is how the "twice the cycle time" .. SRDF/A default cycle switch time is 30 second, and most recents code(5875) you can see the default is 15 seconds.
`symcfg list -rdfg all`