[pve-devel] [PATCH] Qemu Guest IOPS Graphing

James Watson j at mez.co.nz
Thu Nov 26 22:48:21 CET 2015


Is the suggested method something that will be accepted into proxmox? If 
this is the case I can go ahead and get a patch formed.

Kind Regards,
James Watson

On 13/11/15 05:00, Dietmar Maurer wrote:
>> I am still trying to come up with an alternative method that results in
>> no blip on the statistics, but possibly someone has on the list might
>> have a suggestion? I ask as how else are changes going to be made to the
>> RRD tables if slight data loss and some broken graphs (due to missing
>> tables on mixed version clusters) isn't an option?
> This is really not easy, and I thought about the following:
>
> - do not touch existing message format
> - do not touch existing rrd images
>
> instead, send an additional message in pvestatd:
>
> 	PVE::Cluster::broadcast_rrd("pve2.3-vm/$vmid", $data); # current code
>   	PVE::Cluster::broadcast_rrd("pve4.0-vm/$vmid", $modified_data); # new message
>          
> Inside pmxcfs, we simply write pve4.0-vm data into another rrd file (and
> ignore pve2.3-vm messages.
>
> I guess that would avoid data loss (but old data is in other file).
>
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