[rrd-developers] two problem about RRD UPDATE

lily lleelm at gmail.com
Sat Mar 14 05:01:42 CET 2009

Hello everyone :

    Recently I use the rrdtool to create about 12 thousand rrd-file, and
update them in 30s . RRDtools version is 1.2.27 and the OS is Linux - 2.6.9.
The disk is Raid 10 , and the FS is ext2
    I have encountered tow problem :

    The first one is the   performance problem. I read the 'Tuning RRDtool
for performance', and do the vm Optimizations. But it seems not work. The IO
await list is sometime very high.
       Device:    rrqm/s wrqm/s   r/s   w/s  rsec/s  wsec/s    rkB/s
wkB/s avgrq-sz avgqu-sz   await  svctm  %util
      cciss/c0d0   0.00   0.00  0.00 112.44    0.00  907.77     0.00
453.89     8.07   112.99 1001.39   9.23 103.73
    It can't update 12 thousand file in 30s. How can I improve its
performance ???

    The second is sometime when I update the files , there is an error :
         illegal attempt to update using time 1236857494 when last update
time is 1236857494 (minimum one second step)
     but I use the timestamp is 1236886011, not the 1236857494. And I use
the rrdtool last to see the last update time of the file , I find the last
update time is 1236857468, also not 1236857494. I have debug a lot of time ,
but have no idea about it .
   I want to know  is anyone encountered this problem ? Or know the solution

   Thank you  !

Yours Sincerely,
lleelm -at- gmail -dot- com
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