> If I have a pool that made up of 2 raidz vdevs, all data is striped across?   
> So if I somehow lose a vdev I lose all my data?!

If your vdevs are RAID-Z's, there has to be a rare coincidence to happen
to break the pool (two disks failing in the same RAID-Z)...

But yeah, ZFS spreads blocks to different vdevs, trying to balance the
bandwidths of the vdevs.

-mg

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