[lustre-discuss] Lustre over ZFS - RAIDz 9+2

[Indivar Nair]

Hi ...,

I have a couple of questions on Lustre over ZFS.
I have been trying to find answers to these questions on the Internet
for quite some time now, but couldn't find any.

Here are the questions -

1.
Why is it recommended that we create a zpool/OST with 9+2 RAIDz2
arrays instead of the usual 8+2 RAID6 type arrays that align with
Lustre's 1MB RPC properly?

2.
If we used 4K AF drives, with ashift=12, what size chunks (per disk)
will a 9+2 RAIDz2 array with 1MB record size create?

Thanks.

Regards,


Indivar Nair