[collectd] disk aggregation does not work?

[Nitzan Shaked]

(collectd 5.4.0.git)

The following works for me for aggregating all cpu's on a specific host:

    <Aggregation>
        Plugin "cpu"
        Type "cpu"
        SetPlugin "cpu"
        SetPluginInstance "all-%{aggregation}"
        GroupBy "Host"
        GroupBy "TypeInstance"
        CalculateSum true
    </Aggregation>

and creates <host>/cpu-all-sum/cpu-{idle,user,wait,...}

However, the following does not work:

    <Aggregation>
        Plugin "disk"
        PluginInstance "/xvd./"
        Type "disk"
        SetPlugin "disk"
        SetPluginInstance "all-%{aggregation}"
        GroupBy "Host"
        GroupBy "TypeInstance"
        CalculateSum true
    </Aggregation>

... with the intention of aggregating all IOPS for xvda, xvdb, etc.

Any ideas?

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