10 drives - 1 vdev RAIDZ2 vs 2 vdev RAIDZ1

[Artion]

Hi, I'm trying to figure out the differences (benefits/drawbacks) of the two configurations in the topic. Any help is welcome.

Used this for some comparison and comes out that there is a difference of just 3% in space allocation in favor to the 2 vdev Z1 configuration (61,28% vs 58,36% usable space over the raw space - taking in account a 20% free space for optimal ZFS operation).

But I need some feedback from real use cases concerning reliability and speed/throughput of these configurations.

(PS.: Does the 2 vdev Z1 configuration tolerate 1 disk failure per vdev or just 1 disk failure per pool? This is worth reading.)

 

[Pezo]

With very big drives and raidz1 you run the risk data loss when a second drive dies during a resilver.
I'm currently contemplating a similar question actually, just with 12 drives...
But from what I read raidz2 with more than 9 or 10 drives is not recommended.

 

[danb35]

But from what I read raidz2 with more than 9 or 10 drives is not recommended.

vdevs wider than about 10 devices aren't recommended, irrespective of the RAIDZ configuration. Given the options presented by @Artion, I'd probably favor the single RAIDZ2 vdev, but it's a fairly close call, and IOPS may make the difference.