kentukynitemare
Cadet
- Joined
- Jul 25, 2018
- Messages
- 4
I'm putting together a new FreeNAS box and trying to make sure I've got this straight. Critical data is backed up on local external drives and offsite, so this is mostly an exercise to learn how to configure ZFS properly.
I have two 4TB WD Reds from an old NAS build sitting around, and intend to purchase three 10TB external drives, two to shuck for the new FreeNAS build and one to plug into my Windows desktop as FreeNAS' backup target/BackBlaze'd drive. I don't have 100% confidence in this whole drive-shucking plan (never done it before, although folks seem to have had pretty good results) so I want to pair each of the two shucked drives in the new build with a WD Red (because blind faith in my low-use reds.) My understanding is this would net me two 4TB mirrored VDEVs (one each 4 and 10 TB drives), striped together to form an 8TB pool that could withstand the loss of both shucked drives without any data loss.
Assuming all goes well with the two 10TB drives in the NAS for some time I'd like to be able to utilize their storage capacity more fully. To do this, my plan would be to (for 4+10TB mirror VDEVs A and B, spare 10TB C):
Remove 4A, replace with 10C and resilver, creating a 2x10TB mirrored pair
Remove 10B, replace with the pulled 4A and resilver, creating a 2x4TB mirrored pair
Which should leave me with a 2-way 10TB mirror (10A and 10C) striped with a 2-way 4TB mirror (4B and 4A) for a total of a 14TB pool without having to destroy/rebuild the pool, as well as a loose 10TB disk (10B) to use as a Windows-attached backup target, third disk in the 10TB VDEV, or pair with a sixth disk for a third mirror.
Is my assessment accurate? I think I've finally got my head wrapped around the basic ZFS concepts, which usually means I'm missing something.
I have two 4TB WD Reds from an old NAS build sitting around, and intend to purchase three 10TB external drives, two to shuck for the new FreeNAS build and one to plug into my Windows desktop as FreeNAS' backup target/BackBlaze'd drive. I don't have 100% confidence in this whole drive-shucking plan (never done it before, although folks seem to have had pretty good results) so I want to pair each of the two shucked drives in the new build with a WD Red (because blind faith in my low-use reds.) My understanding is this would net me two 4TB mirrored VDEVs (one each 4 and 10 TB drives), striped together to form an 8TB pool that could withstand the loss of both shucked drives without any data loss.
Assuming all goes well with the two 10TB drives in the NAS for some time I'd like to be able to utilize their storage capacity more fully. To do this, my plan would be to (for 4+10TB mirror VDEVs A and B, spare 10TB C):
Remove 4A, replace with 10C and resilver, creating a 2x10TB mirrored pair
Remove 10B, replace with the pulled 4A and resilver, creating a 2x4TB mirrored pair
Which should leave me with a 2-way 10TB mirror (10A and 10C) striped with a 2-way 4TB mirror (4B and 4A) for a total of a 14TB pool without having to destroy/rebuild the pool, as well as a loose 10TB disk (10B) to use as a Windows-attached backup target, third disk in the 10TB VDEV, or pair with a sixth disk for a third mirror.
Is my assessment accurate? I think I've finally got my head wrapped around the basic ZFS concepts, which usually means I'm missing something.