Clint - Tuning ZFS for NVME

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I watched your ELI5 talk from Fosdem and you answered a question about
tuning zfs for NVME drives. When you mentioned adjusting the queue max
are you talking about the sysctls like
vfs.zfs.vdev.sync_write_max_active?

If this is the only way to adjust the queue max, and it's a global
setting, how should this be tuned for a machine that has a pool on
NVME and a different pool with spinning drives?

Also how should this be tuned for a pool of spinning drives with an NVME l2arc?

Thanks,

Clint
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