[rrd-developers] two problem about RRD UPDATE
tobi at oetiker.ch
Sat Mar 14 07:54:26 CET 2009
Today lily wrote:
> 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 problem could be your kernel version, the implementation of
posix fadvise has seen quite some changes.
> 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
I have never seen this problem ...
> Thank you !
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900
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