On Feb 8, 2010, at 9:10 PM, Damon Atkins wrote:
> I would have thought that if I write 1k then ZFS txg times out in 30secs,
> then the 1k will be written to disk in a 1k record block, and then if I write
> 4k then 30secs latter txg happen another 4k record size block will be
> written, and then if I write 130k a 128k and 2k record block will be written.
>
> Making the file have record sizes of
> 1k+4k+128k+2k
Close. Once the max record size is achieved, it is not reduced. So the
allocation is:
1KB + 4KB + 128KB + 128KB
Physical writes tend to be coalesced, which is one reason why a transactional
system performs well.
-- richard
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