Anton B. Rang wrote On 01/17/07 20:31,:
Yes, Anantha is correct that is the bug id, which could be responsible
for more disk writes than expected.
I believe, though, that this would explain at most a factor of 2
> of "write expansion" (user data getting pushed to disk once in the
> intent log, then again in its final location).
Agreed.
If the writes are
> relatively large, there'd be even less expansion, because the ZIL
> will write a large enough block of data (would this be 128K?)
Anything over zfs_immediate_write_sz (currently 32KB) is written
in this way.
> into a block which can be used as its final location. (If I'm
> understanding some earlier conversations right; haven't looked at
> the code lately.)
Anton
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