[pve-devel] [PATCH pve-manager] pvestatd: stream host pressure counters

[Alexandre Derumier]

>>that'd drop all old statistics, and be a bit of a nuisance to upgrade inside
>>a cluster (old nodes get stuff they do not comprehend).

oh ok, I thinked that rrd was able to add new value. (don't have used
rrd since a long time since I'm using influxdb or other metrics
databases)

I'll look to add them in separated rrd files

Le sam. 24 oct. 2020 à 17:43, Thomas Lamprecht
<t.lamprecht at proxmox.com> a écrit :
>
> On 24.10.20 15:46, Alexandre Derumier wrote:
> >> Sounds reasonable. We just need to find a way to add new values
> >> in a compatible way.
> >
> > Last time in 2013, we had added a new rrd "pve2.3-vm/"
> > https://lists.proxmox.com/pipermail/pve-devel/2013-January/005612.html
>
> that'd drop all old statistics, and be a bit of a nuisance to upgrade inside
> a cluster (old nodes get stuff they do not comprehend).
>
> We may rather want to have a new, separate, file for this.
> We could add general support for and error handling now, and to the final add
> with 7.0 next year or so. Maybe there's even a way to add it now without other
> nodes producing errors, but from top of my head I am not sure..
>
> In Proxmox Backup Server we have each metric in a separate file, makes it a bit
> easier to extend on.
>
> # ls -l /var/lib/proxmox-backup/rrdb/host/
> total 160
> -rw-r--r-- 1 backup backup 6008 Oct 23 07:45 cpu
> -rw-r--r-- 1 backup backup 6008 Oct 23 07:45 io_ticks
> -rw-r--r-- 1 backup backup 6008 Oct 23 07:45 iowait
> -rw-r--r-- 1 backup backup 6008 Oct 23 07:45 loadavg
> -rw-r--r-- 1 backup backup 6008 Oct 23 07:45 memtotal
> -rw-r--r-- 1 backup backup 6008 Oct 23 07:45 memused
> -rw-r--r-- 1 backup backup 6008 Oct 23 07:45 netin
> -rw-r--r-- 1 backup backup 6008 Oct 23 07:45 netout
> -rw-r--r-- 1 backup backup 6008 Oct 23 07:45 read_bytes
> -rw-r--r-- 1 backup backup 6008 Oct 23 07:45 read_ios
> -rw-r--r-- 1 backup backup 6008 Jun  4 18:03 read_ticks
> -rw-r--r-- 1 backup backup 6008 May 28 13:00 roottotal
> -rw-r--r-- 1 backup backup 6008 May 28 13:00 rootused
> -rw-r--r-- 1 backup backup 6008 Oct 23 07:45 swaptotal
> -rw-r--r-- 1 backup backup 6008 Oct 23 07:45 swapused
> -rw-r--r-- 1 backup backup 6008 Oct 23 07:45 total
> -rw-r--r-- 1 backup backup 6008 Oct 23 07:45 used
> -rw-r--r-- 1 backup backup 6008 Oct 23 07:45 write_bytes
> -rw-r--r-- 1 backup backup 6008 Oct 23 07:45 write_ios
> -rw-r--r-- 1 backup backup 6008 Jun  4 18:03 write_ticks
>
>
> We could say we keep the base stuff as is in a single file and add
> the new one with a "<vmid>.<metric-name>" scheme.
>
>