When ASM reads my block, it will usually read much more than just the block I requested.

When ASM reads my (8K) block, it will usually read much more than just the block I requested.
4 questions :
1) Am I right when I presume ASM will increase my request to 1 complete AU sized retrieval action done on the I/O subsystem? 
2) Now what interests me is where does the rest of that I/O size sleep / reside ?
3) Under what circumstances will those poor, initially unused and discarded KB's be revived and be reckognized for their true value. Will only certain actions, like a scan, cause the 'overhead' to be used ?
kind regards, Niek

Hi Aman,
ASM does not do IOs .
ASM only gives extent map to clients and clients take that pointers and do direct IO on that block.
This is very much true statement and explains what will happen if data block is not available at buffer .
That's why most of IO errors are getting printed on rdbms alertlog file ,rather ASM .Which inturn confirms my statement...
ASM level DBWR ,LGWR are related to ASM level data processing .
Keeping above things in mind ,it clarifies ASM does not hold any IOs /place on sleep.
ASM at diskgroup level,always does IOs  as per au_size of  that diskgroup .
Regards,
Aritra

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