[mrtg] Strange error when using UCD-DISKIO-MIB

Steve Shipway s.shipway at auckland.ac.nz
Thu Feb 19 22:12:36 CET 2009

> Further testing shows that if I set "Forks: 1" then I can run mrtg in
> Also, if I try to check all 48 drives in both servers via a single config
> file/mrtg run, then it fails.  If I split the config file to check the two
> servers one after the other in separate mrtg runs (24 drives each), then
> it succeeds.

I think you're running out of file descriptors.   See what 'ulimit -n'
returns (you might need a different set of options depending on your OS).
Do the appropriate things to set the FD limit to 1024 or even higher.

Linux example:

[root at slayer src]# ulimit -n
[root at slayer src]# ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 40958
max locked memory       (kbytes, -l) 32
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) unlimited
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited
[root at slayer src]# ulimit -n 2048
[root at slayer src]# ulimit -n

Add this line to /etc/security/limits.conf (if you use the 'mrtg' user to
run the mrtg processes):
mrtg - nproc 1024

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