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Comments
64k
It does depend what you are doing; however I'd say 2048 or 1024 as default
Just ensure that the file system is formatted appropriately for whatever chunk size you use (stride/stripe)
http://busybox.net/~aldot/mkfs_stride.html
I personally think 64-256k works best. It all depends on your purpose. If you are storing large files, a larger chunk size works best.
Check the URL above, it's also important to set your filesystem parameters correctly.
Also set an appropriate read-ahead
Thoughts about 512k?
Are you trying to raid ssd disks? Which controller?
With one of our old san (6130 storagetek ) i tried with 512k one time but it worked well only when storage was used with big files i.e. for the VOD streaming servers. In other cases smaller chunks worked better...
Didnt SSD's have some thing about whatever counts for a sector size being matched being the best?