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Noobie Question on Pool Devices ~ Two Drives: One Undersized and One Not Formated

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A co-worker encouraged me to try unRaid and I am really savoring it thus far. Should have it mastered in a day or two. :-)

So I asked him about his screen clip below and he really didn't have an explanation. He is a long time user.

Why is my 8TB drive only showing up as 5.5 TB and showing on 2.98 TB free with only 24.GB used?

Second, why is my second drive not listing a File Structure like the first drive, btrfs.

--I also noticed I can set a spin down idle time on the first drive, but not the second drive. Not sure why this is.

Lastly, should I when the trial ends, purchase a subscription, and restart this whole process with xfs instead?

UnRaid Pool Devices.jpg

Edited by RaidPC
Added to question on the drives.

  • Community Expert
7 hours ago, RaidPC said:

Why is my 8TB drive only showing up as 5.5 TB and showing on 2.98 TB free with only 24.GB used?

This is the result of having different size devices with btrfs, ignore the total size, used and free are correct.

7 hours ago, RaidPC said:

Second, why is my second drive not listing a File Structure like the first drive, btrfs.

It's for the pool, so there's only one entry.

7 hours ago, RaidPC said:

--I also noticed I can set a spin down idle time on the first drive, but not the second drive. Not sure why this is.

Again, it applies to the pool.

  • Community Expert

Is there a reason you created a pool using two differently sized HDDs? The typical unraid setup would have been to assign the two drives to the "Array" slots NOT a pool.

While there is nothing wrong with using HDDs in pools, it's generally not ideal to mix disk sizes in pools. If you're going to use HDDs in a pool you'll want at least a minimum of 3 of the same sized disks and to use zfs raidz so you can get a speed benefit and a form of parity for the data on that pool.

If I were you, I would put the 8TB disk in Array Slot 1 and the 3TB disk in Array Slot 2, and get a small SSD or two and assign them to a new pool.

Otherwise you're going to end up with a less than optimal disk configuration which will likely lead to issues down the road.

Edited by MowMdown

  • Author

No reason, just a noobie who set it up the first time. I am researching more each day how to do it right.

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