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7.2.4 SSD refuses to format to ZFS

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First of all, I am new to this so please be gentle and speak to me like a newborn.

I am setting up my first NAS and have decided to create the following based on the drives I have available:
Array: 1 x 26tb HDD

Cache: 1 x 2tb SSD ZFS

Pool 1: 2 x 8tb SSD RaidZ1

Pool 2: 3 x 4tb SSD RaidZ1

My issue is that one of the 4tb SSD drives refuses to accept ZFS and will only mount in XFS. When adding the one 4tb to the array it has no issue, but trying to make it part of the ZFS pool it refuses to mount the pool. I also have gone through the format process at the bottom of the main page.

I have done a little research and installed Unassigned Devices and UD+, making sure they are in destructive mode. I have also installed the ZFS Master plugin, and run the drive through PreClear, all to no avail. The drive is the same brand as the other two of the same size.

I must be missing something, and would love any help you all could offer.

Screenshot 2026-03-19 191335.png

Unrelated to your pools, but why are you using exfat for disk1?

  • Author
1 minute ago, trurl said:

Unrelated to your pools, but why are you using exfat for disk1?

I honestly haven't locked in anything yet, so that's still up for grabs. Like I said, I'm new to this and still figuring it out 😂

I'll happily and gratefully take recommendations as to a better setup for my drives.

exfat support is new and might be somewhat limited compared to xfs, btrfs, zfs. XFS is the usual format for array disks.

What do you get from command line with this?

lsblk
  • Author
1 minute ago, trurl said:

What do you get from command line with this?

lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS

loop0 7:0 0 651.8M 1 loop /usr

loop1 7:1 0 173.4M 1 loop /lib

loop2 7:2 0 1G 0 loop /etc/libvirt

sda 8:0 1 3.8G 0 disk

└─sda1 8:1 1 3.7G 0 part /boot

sdb 8:16 0 23.6T 0 disk

├─sdb1 8:17 0 200M 0 part

└─sdb2 8:18 0 23.6T 0 part

sdc 8:32 0 1.8T 0 disk

└─sdc1 8:33 0 1.8T 0 part

sdd 8:48 0 7.3T 0 disk

└─sdd1 8:49 0 7.3T 0 part

md1p1 9:1 0 23.6T 0 md /mnt/disk1

mmcblk0 179:0 0 116.5G 0 disk

mmcblk0boot0 179:8 0 4M 1 disk

mmcblk0boot1 179:16 0 4M 1 disk

zram0 252:0 0 0B 0 disk

nvme1n1 259:0 0 3.6T 0 disk

└─nvme1n1p1 259:4 0 3.6T 0 part

nvme2n1 259:1 0 3.6T 0 disk

└─nvme2n1p1 259:6 0 3.6T 0 part

nvme3n1 259:2 0 3.6T 0 disk

└─nvme3n1p1 259:5 0 3.6T 0 part

nvme0n1 259:3 0 7.3T 0 disk

└─nvme0n1p1 259:7 0 7.3T 0 part

sdb (disk1) has multiple partitions. Click on it to get to its page, then erase partitions then set it to xfs and format it in Array Operation.

  • Author

Done, and here's the updated results:

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS

loop0 7:0 0 651.8M 1 loop /usr

loop1 7:1 0 173.4M 1 loop /lib

loop2 7:2 0 1G 0 loop /etc/libvirt

sda 8:0 1 3.8G 0 disk

└─sda1 8:1 1 3.7G 0 part /boot

sdb 8:16 0 23.6T 0 disk

└─sdb1 8:17 0 23.6T 0 part

sdc 8:32 0 1.8T 0 disk

└─sdc1 8:33 0 1.8T 0 part

sdd 8:48 0 7.3T 0 disk

└─sdd1 8:49 0 7.3T 0 part

md1p1 9:1 0 23.6T 0 md /mnt/disk1

mmcblk0 179:0 0 116.5G 0 disk

mmcblk0boot0 179:8 0 4M 1 disk

mmcblk0boot1 179:16 0 4M 1 disk

zram0 252:0 0 0B 0 disk

nvme1n1 259:0 0 3.6T 0 disk

└─nvme1n1p1 259:4 0 3.6T 0 part

nvme2n1 259:1 0 3.6T 0 disk

└─nvme2n1p1 259:6 0 3.6T 0 part

nvme3n1 259:2 0 3.6T 0 disk

└─nvme3n1p1 259:5 0 3.6T 0 part

nvme0n1 259:3 0 7.3T 0 disk

└─nvme0n1p1 259:7 0 7.3T 0 part

Bedtime for me, but will gratefully continue tomorrow if you're still game. Thanks again.

For the pool issue, reboot and try again, if it still fails to format, post new diags.

  • Author

Reboot didn't work, but another user suggested trying the wipefs and sgdisk commands which did the trick.

Thanks for the support and guidance.

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