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

T

telefonjoker100

Member
Dec 30, 2020
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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.

Unbenannt1.PNG

The Storage shows me that 2.90TiB are used.

Unbenannt2.PNG


However when i look at the VM Disks its only.
Unbenannt3.PNG



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