Package: collectd
Version: 4.4.2-3
I turned on the "disk" plugin with the default options. This
resulted in a bunch of rrds with names like this:
/var/lib/collectd/rrd/chiark.greenend.org.uk/disk-md*/*.rrd
/var/lib/collectd/rrd/chiark.greenend.org.uk/disk-dm*/*.rrd
/var/lib/collectd/rrd/chiark.greenend.org.uk/disk-sd*/*.rrd
However, on Linux nowadays device names and minor numbers are not
stable. That means that if I reboot and different numbers get
assigned, data from quite logically or physically different devices
may be aggregated into a single rrd.
There should be a way for me to specify device name patterns in /dev,
which the disk plugin should stat() to find the major and minor
numbers.
I would suggest a new directive:
LogicalDisks "/dev/<volumegroup>/*" [for example]
Uses glob() to find the list of names, and stat() to find the
device numbers, and then records statistics corresponding to that
device (comparing device numbers rather than names in
/proc/diskstat) in
/var/lib/collect/rrd/<host>/logicaldisk-<mangled-path-in-dev>/*.rrd
If not used in combination with "IgnoreSelected true" this would
record some information twice.
Ian.
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