Coolamasta
Dabbler
- Joined
- Feb 16, 2019
- Messages
- 11
Hi all, just wanted to see what peoples thoughts were on Pool/vdev design for mainly media storage. I am quite new to FreeNAS and how ZFS works, I have a bunch of 8TB drives already and want to buy some more but not sure what best config of pool should be for now and future expansion.
I plan to have 8 or 9 x 8TB drives total for now and want decent I/O over 10G network and also good redundancy, here's the options I have been thinking about for a single media Pool,
From what understand from reading a bit more into ZFS, more vdevs will give better I/O but dropping to more vdevs in RZ1 is a greater failure risk as you can only lose a single drive so dropping to just a 3-disk RZ1 vdev rather than 4-disk might be best option, what are peoples thoughts?
Also can anyone answer this - just say for now I used 6 x 8TB drives in 2 x 3-disk vdevs and then filled them over half full and then further down the line added 3 x more disks in another vdev, will FreeNAS over time move some of the data from the existing 2 vdevs and balance it over the 3rd or will data just stay on the existing 2 and then start to fill up the 3rd vdev when the other 2 get filled up? Sorry if silly question but just after some clarification :)
Many thanks for any help.
I plan to have 8 or 9 x 8TB drives total for now and want decent I/O over 10G network and also good redundancy, here's the options I have been thinking about for a single media Pool,
- 8 x Drives in single vdev in RZ2 (Cant think of a good reason to use this design?)
- 2 x vdev sets of 4 x Drives in RZ2 (Best Redundancy but a lot of lost capacity?)
- 2 x vdev sets of 4 x Drives in RZ1 (Good amount of capacity but higher failure risk?)
- 3 x vdev sets of 3 x Drives in RZ1 (Best I/O?)
From what understand from reading a bit more into ZFS, more vdevs will give better I/O but dropping to more vdevs in RZ1 is a greater failure risk as you can only lose a single drive so dropping to just a 3-disk RZ1 vdev rather than 4-disk might be best option, what are peoples thoughts?
Also can anyone answer this - just say for now I used 6 x 8TB drives in 2 x 3-disk vdevs and then filled them over half full and then further down the line added 3 x more disks in another vdev, will FreeNAS over time move some of the data from the existing 2 vdevs and balance it over the 3rd or will data just stay on the existing 2 and then start to fill up the 3rd vdev when the other 2 get filled up? Sorry if silly question but just after some clarification :)
Many thanks for any help.