Understand NFS backup time vs disk format

J

Jeremy_M

New Member
Jul 17, 2019
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Hello everybody,

i'm want to understand my backups time quite long in my opinion on a NFS share.
I have a pve datacenter with 2 nodes and an NFS share to have a shared storage (and i want to use the same for backups, i know its not a good practice but for the moment i cannot do more...)

i launch the backup command via GUI but in command line that is this one :
vzdump 118 --storage my-nfs-share --mode suspend --remove 0 --node my-node --compress lzo

I tried with the same VM (not a CT) but different disk formats and i have a surprising result i want to understand.

Hard drive type ​
Time to backup ​
QCOW 2 of 140 GB (default)00:59:22
RAW of 140 GB00:57:42
VMDK of 140 GB00:10:18

Can you help me to undertstand these differents ?

Thanks.
 
Hi,

There must something wrong with the vmdk.
Because 140 GB / 618 sec is about 231MB/s write speed plus the same has to be read.
Is this possible? Do you have a 10GBit NIC to the NAS?
If you write "of 140GB" do you mean data or disk size?
 
Generally is vmdk in Proxmox not for productive use.
It is just for importing from ESXi.
 
I agree, I do not wish to use this format. I am trying to understand the differences in results.
Thanks.
 
I have tried it here but can't see the different.
Maybe vmdk is thin allocated and qcow and raw are fully allocated.
How large are the files?

Code: 
du -h <Path to file>
 
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