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I have a ZFS RAIDZ-7 made by 8x4TB on a Proxmox 6 (linux kernel version: 5.4.78-2-pve, openZFS version: 0.8.5-pve1).

An unfortunate astral conjunction force me to remove 3 disk from my RAIDZ. In around 1 or 2 weeks 5 new disks comes to me.

Not too bad, raidz7 can suffer 3 loss. BUT one on the remaining disk is dying (slowly, I suppose can survive for some time).

I have a 2TB and a 3TB disk available right now.

So I thought about building an mdadm strip array with the 2TB and 3TB and use the resultant 5TB raid as a disk for the raidz.

There is a pure zfs alternative? Is possible to create a VDEV with the 2TB+3TB disk and use it as a disk for the RAID-Z?

Steve81
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No, ZFS currently does not support concatenated devices to be used as a mirror leg. You must first use md or lvm to concatenate the two devices, the issue zpool replace to replace one of the removed disk.

Such a setup is only good for short-term data recovery; I would not use it for longer than strictly required.

shodanshok
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