[SOLVED] ZFS Storage blocks 50% more space than needed

[telefonjoker100]

Hello everyone,

i have an issue regarding zfs and proxmox storage.

I have a 4x 4Tb sata disk as a ZFSZ1 raid installed. Proxmox tells me that 10.24TiB are available. However i cant create a a 10TiB VM Disk for this.

To show you were i think the problem might come from i figured out following things.

I added this Storage to a NAS-VM.



The Storage shows me that 2.90TiB are used.




However when i look at the VM Disks its only.




Where does the difference of close to 50% more space needed come from? How can i fix it?
In a previous setup i was able to use more than 8 TiB which is now not possible.

Thanks for your help/your advice.

Best regards
Leo

 

[stephan.schulze]

Hi,

same issue here; short facts on this:

• 6x 480 GByte Samsung datacenter SSDs
• RAIDZ2
• ZFS storage having a total of 1.68 TB free volume (ok so far due to "RAID Z2")

But why does a 50 GByte virtual disk eat up ~102 GByte of space from the usable amount of 1.68 TB?

Thanks for explanation.

 

[apoc]

This has to do with the Raid-Z allocations of the vdevs.
Had the same here. Explanations inside:
https://forum.proxmox.com/threads/u...reated-on-raidz3-pool-vs-mirrored-pool.65018/

 

[apoc]

And also it is recommended to not fill up a ZFS pool beyond 80% ...

 

[telefonjoker100]

Thanks for your advise. I could fix it now. I didnt know that i can edit the blocksize in the Datacenter/Storage UI.