[gpfsug-discuss] sublocks per block in GPFS 5.0

[Marc A Kaplan]

Look at my example, again, closely.  I chose the blocksize as 16M and 
subblock size as 4K and the inodesize as 1K.... 
Developer works is a good resource, but articles you read there may be 
incomplete or contain mistakes.

The official IBM Spectrum Scale cmd and admin guide documents, are 
"trustworthy" but may not be perfect in all respects.  "Trust but Verify" 
and YMMV. ;-)

As for why/how to choose "good sizes", that depends what objectives you 
want to achieve, and "optimal" may depend on what hardware you are 
running.
Run your own trials and/or ask performance experts.  There are usually 
"tradeoffs" and OTOH when you get down to it, some choices may not be 
all-that-important in actual deployment and usage.  That's why we have 
defaults values - try those first and leave the details and tweaking aside 
until you have good reason     ;-)

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