Where is my disk space?

[j4nd3r53n]

I am managing a TVS-h1688X device for my company and have recently upgraded the 12 disks from 12TB (actually 10TB) to 20TB (actually ~18TB), and I'm surprised to find that instead of close to 200TB, I have about 160TB of total storage in the pool. I have recently deleted all data and made sure they weren't just moved to some recycle bin; so where have the ~40TB gone? Surely zfs or the OS don't require 20% overhead? All I want is storage space - I have no interest in apps or VMs or similar.

[dolbyman]

Some screenshots of the storage management would help...otherwise its pure stabbing in the dark

[j4nd3r53n]

Certainly - but which parts do you need? Here is one screenshot - not sure if it helps:

NAS1.png

[dolbyman]

the pool details that show overprovisioning ,snapshots, etc

[dolbyman]

I mean the detail page of your pool .. here is mine (1288X) (8x6TB in RAIDz2)

HDD_Pool_1288X.JPG

What is your RAID config ? Overprovisioning, etc

[j4nd3r53n]

Thank you for getting back to me - I've been away from my desk due to a covid outbreak, so I didn't see your reply, sorry about that. I have attached a screenshot of what you asked for.

NAS2.png

[dolbyman]

you have a raid50 with uneven stripe members 70 + 88TB

I would have guessed this would come out to 70x2=140TB ..but that fact that it's more is weird.

Best to open a ticket with QNAP, that config seems screwed

[Kunzite]

I would have guessed this would come out to 70x2=140TB ..but that fact that it's more is weird.

It's not weird; you're thinking of the classic RAID50 but this is a zpool containing two RAIDZ1 vdevs of different sizes. ZFS won't do stripping, but some sort of balancing according to the free space on each vdev.
So the value OP is getting for the zpool is about right, IMO.

[dolbyman]

It's the balance of what ZFS 'can' do and what the QNAP GUI 'lets' you do.

So this 'RAID50' (as QNAP calls this) is not actually several RAID5 striped in RAID0, but something else ?

I would be interested to see the config for this:

Code: Select all

zpool list -v -H

and if the large pool is zpool1, this please

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zpool status zpool1

[Kunzite]

So this 'RAID50' (as QNAP calls this) is not actually several RAID5 striped in RAID0, but something else ?

I would be interested to see the config for this:

Code: Select all

zpool list -v -H

and if the large pool is zpool1, this please

Code: Select all

zpool status zpool1

Quite likely; since "RAID5" itself is not RAID5 but RAIDZ1, "RAID0" should also be ZFS' version (it would have been a pity if QNAP used ZFS on top of mdraid). But I'm new at this ZFS/QuTS thing, and I haven't actually seen how a "RAID50" looks like.
Excellent idea to run these commands. The proof of the pudding is in the eating, and the truth about the zpool configuration is revealed through command line tools