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List:       tru64-unix-managers
Subject:    HSG80 MAX_READ/MAX_WRITE and AdvFS Wblks
From:       RichGlazier () netscape ! net
Date:       2002-12-27 22:31:18
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- Oracle 8.0.6.3  
- v5.1 PK5 
- 3 node GS80 cluster 
- AdvFS (no DIO enabled)

Has anyone tuned MAX_CACHE_READ or WRITE or MAX_CACHE_TIMER on an HSx, or tuned Rblks \
or Wblks on AvdFS file domains (showfdmn / chvol), or know their relationship?

What are the effects of setting MAX_READ_CACHED_TRANSFER_SIZE and \
MAX_WRITE_CACHED_TRANSFER_SIZE to something other than the default (32)? Why does \
sys_check suggest 256?  Has anyone tuned this parameter?  Also,  where does tuning \
MAX_CACHE_TIMER come into play?  

Here is how I see the flow of I/O:

Oracle --->   (UBC) -->     AdfVS --->     UNIT cache --->  Storageset chunk
(256 blks)128k (256 blks)128k (256 blks)128k (256 blks)128k (256 blks)128k  

Any other AdvFS or HSG80 tuning I should consider?  



Thanks in advance.


Rich Glazier


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