Comment by toast0
8 hours ago
> 1. From my own experience, most people who use a ZIL for faster sync writes are wasting space. You only need five seconds of peak throughput (for a 10Gb connection that's ~5 GB). Create a pair of 25 GB partitions for the ZIL rather than dedicating entire devices.
You might benefit from the same technique for a "special" vdev... If you run an all spinners array, but the metadata is on a small partition, you might get better seek times during metadata scans, since everything will be closer together? And/or if you use raidz for your regular vdev, but mirror for the metadata, you'll have more capacity for metadata reads.
That's an interesting idea. Reminds me of how people would put their swap partitions at the end for faster speeds. If I did an N-way mirror I get could attach/detach as needed and get much more performance on reads.