grant lowe wrote:
Ok. I blew it. I didn't add enough information. Here's some more detail:
Since ZFS never writes data back where it was, it can coalesce multiple outstanding writes into fewer device writes. This may be what you're seeing. I have a ZFS IOPs demo where the (multi-threaded) application is performing over 10,000 synchronous write IOPs, but the underlying devices are only performing about 1/10th of that, due to ZFS coalescing multiple outstanding writes.
Sorry, I'm not familiar with what type of load bonnie generates.
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