QNAP mount. Total free size problem

[alderaan79]

Good morning, i'm testing a proxmox backup server. I've mounted my qnap in fstap using nfs and total space calculated is right (23.63 TB).

If I connect qnap directly as datastore, it works, but I see as total space 40 GB instead of 23 TB.



First screenshot QNAP mounted in fstab



Second screenshot: same path but directly mounted iwith Add Datastore and fullpath: //192.168.40.9/bckproxmox/

Free space is only 41.17 GB

Can someone, please, tell me what i'm doing wrong?

Thank You
Gianluca

 

[Chris]

Second screenshot: same path but directly mounted iwith Add Datastore and fullpath: //192.168.40.9/bckproxmox/

Hi,
you are not doing what you are expecting to do. The provided backing path for datastore creation is always a path on a local filesystem. So your first setup is the correct one, if you want to use a network storage as backing storage for the datastore (I assume you are aware of shortcomings and limitations, leading to such setup not being recommended).

In you second setup, the provided path will simply create a local folder structure on your root filesystem, so the root filesystems free space is what you see for the datastore.

 

[alderaan79]

Hi,
you are not doing what you are expecting to do. The provided backing path for datastore creation is always a path on a local filesystem. So your first setup is the correct one, if you want to use a network storage as backing storage for the datastore (I assume you are aware of shortcomings and limitations, leading to such setup not being recommended).

In you second setup, the provided path will simply create a local folder structure on your root filesystem, so the root filesystems free space is what you see for the datastore.

HI, thank you. I've a doubt. What if nas goes offline? I mean, in that situation, when a backup starts and nas is offline, is there the possibility that proxmox writes in /mnt/datanas without partition mounted? In that case space will be fulfill quickly....is it correct or it will fails?

Thank you.

 

[Chris]

HI, thank you. I've a doubt. What if nas goes offline? I mean, in that situation, when a backup starts and nas is offline, is there the possibility that proxmox writes in /mnt/datanas without partition mounted? In that case space will be fulfill quickly....is it correct or it will fails?

Thank you.

No, this will fail as a file handle is opened and kept in memory for accessing the chunk store. So this will fail. Also, the underlying mount point does not contain the necessary datastore folder structure only constructed on datastore creation, only the filesystem mounted on top will have that.

 

[alderaan79]

Thank you for support.