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Faulty storage capacity readings

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Fil.Mag.Br.
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Faulty storage capacity readings

#1

Post by Fil.Mag.Br. » 20 Jul 2019 23:14

Hi!

First time using ZFS and raid-z so this might be a quick discussion.

I've set up my xigmanas with 3 drives (3x4TB) using raidz1. The system tells me i've got 11.95 TB free space which would be fine if i'd just used the disks without raid. But with raidz1 it should be more like 8TB if i'm not mistaken.

Is there something I missed?

Tell me if you need more info, screenshots, config, etc. New to this, don't really know whats needed to help me out.

Cheers!

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ms49434
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Re: Faulty storage capacity readings

#2

Post by ms49434 » 20 Jul 2019 23:42

Fil.Mag.Br. wrote:
20 Jul 2019 23:14
Hi!

First time using ZFS and raid-z so this might be a quick discussion.

I've set up my xigmanas with 3 drives (3x4TB) using raidz1. The system tells me i've got 11.95 TB free space which would be fine if i'd just used the disks without raid. But with raidz1 it should be more like 8TB if i'm not mistaken.

Is there something I missed?

Tell me if you need more info, screenshots, config, etc. New to this, don't really know whats needed to help me out.

Cheers!
There's nothing wrong with it. If you have 3 drives with 4TB capacity each, nobody will doubt that the total capacity is 12TB.
It only depends on what you make of it.
If you have them configured as JBOD, you will be able to store up to 12TB of data.
If you have them configured as RAIDZ1, you will be able to store up to 8TB of data (the remaining 4TB will be used for checksums).

Alloc/Free provides raw disk space information of your pool (12TB), whereas Used/Avail reports logical disk space information (8TB).
Used/Avail lists storage information after all redundancy is taken into account but is impacted by compression, deduplication and quotas.

You can choose whether you want Alloc/Free or Used/Avail displayed.
Go to Disks > ZFS > Settings and check/uncheck "Show Used/Avail"
disks_zfs_settings.png
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1) XigmaNAS 12.0.0.4 amd64-embedded on a Dell T20 running in a VM on ESXi 6.7U2, 22GB out of 32GB ECC RAM, LSI 9300-8i IT mode in passthrough mode. Pool 1: 2x HGST 10TB, mirrored, SLOG: Samsung 850 Pro, L2ARC: Samsung 850 Pro, Pool 2: 1x Samsung 860 EVO 1TB , services: Samba AD, CIFS/SMB, ftp, ctld, rsync, syncthing, zfs snapshots.
2) XigmaNAS 12.0.0.4 amd64-embedded on a Dell T20 running in a VM on ESXi 6.7U2, 8GB out of 32GB ECC RAM, IBM M1215 crossflashed, IT mode, passthrough mode, 2x HGST 10TB , services: rsync.

Fil.Mag.Br.
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Re: Faulty storage capacity readings

#3

Post by Fil.Mag.Br. » 20 Jul 2019 23:55

That cleared things up! Thanks a lot.

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