stuck on low scrub performance

[Tobias Oberstein]

>> Note: the pool consists of 4 disk sets (striped) with 6 disks each
>> (RAID-Z2).
> Also, FWIW, I also find a scrub starts very slow for the first couple
> hours, then speeds up drastically. I also only have ~20TB so perhaps
> this scales?

I am wondering about this too, eg how large can one make a _single_ zpool?

Say I create a single zpool of N x 6 disks, where each 6er set is a RAID-Z2.

Currently, I have N=4 (with 6TB SAS disks) .. and seems works very well.

Will it work as well with N=16? Assuming I have enough SAS bandwidth of 
course ..

Oracle ZFS Storage ZS5-4 maxes out at 9PB.

Anyone knows about the zpool layout of this baby?

Cheers,
/Tobias