Scott Meilicke wrote:
I am still not buying it :) I need to research this to satisfy myself.
I can understand that the writes come from memory to disk during a txg write
for async, and that is the behavior I see in testing.
But for sync, data must be committed, and a SSD/ZIL makes that faster because
you are writing to the SSD/ZIL, and not to spinning disk. Eventually that data
on the SSD must get to spinning disk.
But the txg (which may contain more data than just the sync data that
was written to the ZIL) is still written from memory. Just because the
sync data was written to the ZIL, doesn't mean it's not still in memory.
-Kyle
To the books I go!
-Scott
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