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proxmox ve 3 slow backup to nfs share backed by iscsi

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The storage for my VM disks right now is iSCSI backed so I can't do snapshots unfortunately. So I have set up a NFS share on another system, and the underlying storage for that is iSCSI backed also, but on completely separate drives on a completely separate iSCSI network.

The NFS share on the host is setup for async. This is also a very fresh installation of Proxmox ve 3.0, with the storage update.

When I try to do a backup of a KVM VM, whether it's running or not I get about 15MB/s / 15MB/s read/write.

My whole network is gigabit, and I'm certain I should be getting more than this, but I cannot yet determine why.

When I use the tool slurm on the NFS host I see that traffic bursts. When it bursts it can do upwards of 90-100MB/s, but then drops down to nearly nothing. So I suspect the 15/15 is simply an average over time. I do not know why it is bursting like this.

My googling has not yet turned anything up. Any ideas?

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