[Ganglia-developers] Disk usage and NFS mounts

[Rick M. <rf...@os...>]

I noticed on our cluster that all nodes had the same "Most Full Disk
Partition" percentage listed.  Turns out that ganglia isn't discerning
remote NFS filesystems quite right.  The remote_mount function in
gmond/machines/linux.c looks for a ":" to determine if a partition is NFS
mounted.  This of course works great most of the time.  However, our
cluster uses NFS mounted root partitions that are shared by all nodes.  In
/proc/mount, the lines look like

    rootfs / rootfs rw 0 0
    /dev/root / nfs ro,v2,...

There is no ":", so it treats this filesystem as local, and since it is
the most full, it is reported by every node.  It would be better to leave
this out.  Obviously the second line is easily weeded out because of the
"nfs" filesystem type.  However, the first line will be the same even is
the / filesystem is local.

Has this been brought to anyone's attention before?  Has anyone attempted
to add some logic to remote_mount() to fix this?  I just wanted to throw
this observation out there.

--Rick