Data Coalescing

Hello,

I was going through performance documents and got stuck at data Coalescing.

If I understand currently, FLARE will coalesce small sequential write I/O or partially sequential I/O to make one 64kB element in cache and will re-calculate the parity and write both data and parity to disk.

Is the above understanding correct? How does data coalescing works in Clariion and VNX?

Thanks

Sushil