New to FreeNAS and had a few questions about Drive Size setup

[Gilgameshxg]

Hello!

I built a Custom FreeNas based on the hardware PDF 2016. I will link the hardware below but my end goal is to have 8 10TB drives in a Raidz2 in a single VDev currently I will have 4 10TB and 3 5TB and 1 4TB. My questions are

1. Is this a good idea?
2. how long am I looking at for a resilver process for a failed drive?
3. Anything else should I take into consideration?

Currently I only have 17TB of data.
Hardware below:

Case: Thermaltake View 71 , https://www.amazon.com/d/Computer-C...543288615&sr=1-1&keywords=thermaltake+view+71

Motherboard: Supermicro Micro ATX DDR4 LGA 1151 Motherboards X11SSM-F-O , https://www.amazon.com/gp/product/B018AX44Q4/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

CPU: Intel Xeon E3-1240v6 , https://www.amazon.com/gp/product/B06XX8CHT2/ref=oh_aui_detailpage_o02_s01?ie=UTF8&psc=1

RAM: Timetec Hynix 32GB Kit (2x16GB) DDR4 2133MHz , https://www.amazon.com/gp/product/B07DL4CG6K/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

As well as other non-sense that doesn't really matter.
Thanks in advance!

 

[Gilgameshxg]

Also would it be better to do the Raidz3 or Raidz2 because more space so less space used on each drive for reesilver? Not sure how the performance/resilver works for more drive space less data space used on each vs the Raidz*

 

[pschatz100]

If you put all those drives into one pool, the system will treat them all as 4TB drives. You can do this, and swap out the drives one by one as budget permits, but remember that your capacity will always be limited by the smallest drive in the pool. Once all the disks are 10TB drives, you will have your full capacity. I did something similar when I was upgrading from 2TB drives to 4TB drives.

RaidZ2 or RaidZ3 will depend upon how much tolerance you have for risk. Obviously, more redundancy is less risky. Personally, I think that with disks 4TB or larger, it is wise to go with RaidZ2. If the data is really important, then Raidz3 is safer. There are quite a few articles written about this if you search on the web, although I haven't seen any that specifically addressed 10TB drives.

Resilvering time will be related to how much data you have. More data = longer time. Somebody else might be able to give specifics for your situation.

Don't forget to have a backup solution. RaidZ2 or RaidZ3 is not a substitute for a proper backup.

 

[Scharbag]

As others have said: RaidZx selection has to do with the AVAILABILITY of your data. Data loss is only mitigated through the use of backups. Or, stated another way: RAID NEVER replaces backups. /PSA :)

My system typically takes 12-14 hours to resilver a 4TB disk in my production pool. Pool is 77% full. 10TB drives will take longer when they get full. RaidZ2 has not failed me from an availability standpoint on my production pool. I also back everything up to a second RaidZ2 pool. For me, RaidZ3 is not needed as I can tolerate downtime. RaidZ1 should not be considered with large drives.

Cheers,