Hello,

 

I am thinking intensively about switching from TrueNAS to UNRAID, but one thing is not giving me a break - I searched the Internet for a similar configuration but did not find it anywhere, this is also what I am asking you to explain to a noob how it works.

 

I have the following configuration of a home computer that is my NAS (I used it as a NAS + a few applications and one virtual machine):
8x Exos X18 18TB
1x M.2 Patriot P300 128GB

 

Up until now, I've been using TrueNAS, on which it was all tied together in RAIDZ2.

That is, two drives could fail and I still had access to all my data, and I had the option to swap the drives for new ones in case one of the above failed (which also already happened) without losing any data.

 

Unraid has parity drives which is kind of new to me.

 

What configuration would be best for me wanting to get at least a similar level of data loss protection?

 

2x Exos as parity drives
6x Exos for data in RAIDZ?

As I understand it, when one of the data disks fails, the RAIDZ array should rebuild itself and operate on a reduced number of disks but with access to all data.

 

or maybe
2x Exos as evenness disks
6x Exos for data in RAIDZ2?
Or is it total overkill to secure the data?

42 minutes ago, Kju said:

2x Exos as parity drives
6x Exos for data in RAIDZ?

You cannot have parity with raidz, with Unraid you have two options:

 

1. assign all the disks to the array, with single or dual parity, with dual parity it can handle any two failed devices, but each data disk will be an independent volume, can be zfs or another supported filesystem  (xfs or btrfs)
2. create a raidz2 pool with the 8 devices, same as you were doing with TrueNAS

 

Each has advantages and disadvantages, main ones are posted here:

https://forums.unraid.net/topic/131857-soon™️-612-series/?do=findComment&comment=1243850