W dniu 2010-11-16 22:28, Kelman, Tom pisze:
Radoslaw,
What is your reasoning behind using "many" MAN datasets? The system only records to one
dataset at a time, unlike paging datasets which are all being used. I've found that 2 large
datasets and one smaller "emergency" dataset are sufficient. As long as the dump process
is running properly SMF just switches between the two large datasets, and the smaller dataset
doesn't even get used. You only need the smaller one in an emergency when something interferes
with the dump processing, like an operator cancelling the task.
Well, it depends on your MAN offload policy. I like the following:
All the datasets are equal in size.
The more temporary SMF activity the more (not bigger) MAN datasets as a
buffer for the SMF flood.
SMF dump can be to slow to follow temporary SMF activity peaks - then
SMF will take another and another dataset. From the other hand single
offload (dump) job will not take to much time and will not block the
only remaining MAN file.
Many smaller MAN datasets could allow you to perform (more easily) SMF
dump ad hoc (you just need to analyze fresh records).
BTW: I don't like consecutive SWITCH SMF commands to make all MAN
datasets "DUMP REQUIRED" status and then perform massive daily dump - it
means than SMF records have to be collected in memory. I write about it,
because I met such scenario quite frequently. It works only when SMF
activity is really predicable and small.
BTW: "many MAN datasets" could also mean 3 of them. Sized that one is
usually big enough for whole day (at least day shift) processing.
YMMV.
Last but not least: it was obvious for me that MAN datasets are not used
in parallel. I wasn't clear about it, so it could be misleading; I'm
sorry for that.
--
Radoslaw Skorupka
Lodz, Poland
--
BRE Bank SA
ul. Senatorska 18
00-950 Warszawa
www.brebank.pl
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Wedug stanu na dzie 16.07.2010 r. kapita zakadowy BRE Banku SA (w caoci wpacony) wynosi 168.248.328 zotych.
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