Really, nobody able to help here?
Also tried to ask via our FileMaker Tecnical liason, but so far no real answer.
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I don't think there is a recommendation. There are more important factors for good disk i/o than block size, especially in the FM world.
In the MS SQL world the underlying assumption is that you are already working with the fastest hard disks that you can get (15,000 rpm for instance). Those are rare in the FM world, especially with so many people loving the mac mini that spins at only 5,400 rpm. Fiddling with the block size on slow hard disk is not going to give you much extra performance (if any), going with af faster disk is the way to go there. Given your VM deployment I am going to guess the hardware is already up to par for good performance.
IIRC MS SQL Server either reads or writes in 64kb chunks and that's where the recommendation comes from. I don't know how FMS reads or writes and the topic never came up in any of the troubleshooting sessions with the FMI engineers.
Would be nice to have a definitive answer though...
Got a first answer from our FileMaker contact. Two recomandations for further reading:
and the information that FileMaker is saving in 4KB blocks and therefore this cluster size should probably be optimal.
It would be nice with an official recomandation.