VM used Double disk space in local-zfs. cant find the solution. please help

[rptechworld]

Hello,

I have two promox server.
server 1 and server 2 are same clone. both server have same config and same vm .

but server1 used 94% disk space but server 2 used 43% disk space.

server 2 are working fine but server 1 get disk space full and all vm stuck.

please help me about this issue.

 

[Moayad]

Hello,

Compare both server using df -h to see where server 1 have use more space (if both server are the same storage size and same VMs)

 

[rptechworld]

Hello,

Compare both server using df -h to see where server 1 have use more space (if both server are the same storage size and same VMs)

Here is result

server 1:



server 2:



result for : # zfs list

server 1:



server 2:



result for # zfs list rpool/data/vm-101-disk-0

server 1:



server 2:




VM size on both server is different but i was restore both from qmrestore with same backup file.

Also if i delete vm 101 from server 1 and restore it to storage "local" instead of "local-zfs"
its used same space as sever 2. like 18 GB but used 39GB in local-zfs.


any solution really help me.

 

[Moayad]

VM size on both server is different but i was restore both from qmrestore with same backup file.

Also if i delete vm 101 from server 1 and restore it to storage "local" instead of "local-zfs"
its used same space as sever 2. like 18 GB but used 39GB in local-zfs.

can you please share the output of `cat /etc/pve/storage.cfg` command?

 

[rptechworld]

Here is result of # cat /etc/pve/storage.cfg

server 1:



server 2:

 

[Moayad]

Well, the Thin provision [0] on zfspool for server 1 is disabled. (See the below link for more info about sparse). Try to enable the "sparse 1" on the server 1

[0] https://pve.proxmox.com/pve-docs/pve-admin-guide.html#storage_zfspool

 

[rptechworld]

Hi,

i edited it from #nano /etc/pve/storage.cfg

but still not change in disk space.

server 1:



server 1 : storage is still same

 

[rptechworld]

please help me to enable thin provision as about mehtod. but no change in my storage.

 

[Moayad]

You can enable the thin provision by going to the PVE Web UI Datacenter ⇾ Storage ⇾ select the storage and edit it then check the Thin provision option then ok

 

[rptechworld]

Its already enabled in both server 1 and server 2



But still its not freeup space.

 

[fabian]

it will only affect new volumes - you can check whether 'refreservation'/'refquota' is set on individual datasets to see if they are thin provisioned or not.

 

[rptechworld]

I dont know how to check whether 'refreservation'/'refquota' is set on individual datasets for thin provision. can you help me how to check.

 

[fabian]

zfs list -o name,refreservation,refquota -r POOL

 

[rptechworld]

Here is result: # zfs list -o name,refreservation,refquota -r rpool



is that thin provisoin enabled on all VM ?

 

[fabian]

yes. so then I'd check the following:
- different pool setup (e.g., raidz vs mirror) - see https://pve.proxmox.com/pve-docs/chapter-sysadmin.html#sysadmin_zfs_raid_considerations
- trimming the FS inside the VM