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wobbler
Asked: 2019-10-23 16:37:12 +0800 CST

Migrated from FreeNAS. How do I convert my ZFS Zpool into Linux Raid 5 equivalent

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TL;DR - How do I convert my imported Z-pool to a RAID setup (or LMV?) that I'll be able to recover/rebuild when/if a disk fails?

I migrated from FreeNAS. Had a RAID-Z (equivelant to Raid 5, I think - where one disk can fail) made up of 4 disks.

I moved, recently, to Ubuntu Server and was able to import the Zpool without too much fuss. It's working - I have access etc.

I installed WEbmin for ease, and noticed that the volume isn't showing in the raid section. I can see the individual disks on the partitons sections, but nowhere else.

So it occurs to me. What if a disk fails now. What happens? how will I rebuild it without the GUI. Can I even rebuild it. Is there a way in Webmin to covert the zpool to something it will be able to work with should a disk fail?

Side note - the dashboard of webmin is report a pretty huge total storage amount (i only have about 20TB plugged in... 4x5TB zpool disks and a small SSD for OS.)

Local disk space    8.95 TB used / 96.63 TB free / 105.57 TB total
data-recovery raid zfs

1 Answers

  1. Best Answer

    I installed WEbmin for ease, and noticed that the volume isn't showing in the raid section. I can see the individual disks on the partitons sections, but nowhere else.

    Because ZFS is not using DM-Raid to manage redundancy.

    It's still redundant. Nothing has changed with the file system; you simply mounted it on a different system.

    You cannot convert it. You can delete what you have, and set up a new file system, either using btrfs to manage redundancy, or dm-raid. But I see no reason to do so; zfs is supported.

    But you cannot use the dm-raid tools, which is what webmin shows in the raid section, to manage redundancy on zfs. You have to use zfs-tools.

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