Newer system symlink /etc/mtab to /proc/mounts which makes root filesystem seem mounted twice, once as type rootfs and once for the real device.
When / is selected for df plugin, skip the rootfs mount-point as real root is usually mounted right on top of it. Not skipping it causes rrdtool to complain about two updates for the same timestamp, the first entry for rootfs passes but rrdtool complains when stats for the second occurrence for real filesystem is being considered. Signed-off-by: Bruno Prémont <[email protected]> --- diff -NurpP collectd-5.0.1.orig/src/df.c collectd-5.0.1/src/df.c --- collectd-5.0.1.orig/src/df.c 2011-10-14 22:49:49.000000000 +0200 +++ collectd-5.0.1/src/df.c 2011-11-01 18:21:04.124973135 +0100 @@ -228,6 +228,8 @@ static int df_read (void) { if (strcmp (mnt_ptr->dir, "/") == 0) { + if (strcmp (mnt_ptr->type, "rootfs") == 0) + continue; sstrncpy (disk_name, "root", sizeof (disk_name)); } else _______________________________________________ collectd mailing list [email protected] http://mailman.verplant.org/listinfo/collectd
