adjust filesystem I/O block size

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Is it possible to adjust the I/O block size of a filesystem after creating it?

e.g.

stat command shows I/O block size, which is retrieved from stat->st_blksize  (Optimal block size for I/O).

On my RH9, the block size is 4096.  How this number was initially set?  How to adjust it (or is it possible to adjust it?)  I don't see interface in sysctl .



Regards,
Shan Jing

Enterprise Services Unix Group - New York
Chief Technology Office (CTO)
Global Technology and Operations(GTO)
Deutsche Bank
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