There probably was a change in the defaults for creation quite a while back (after yours were created), but this only affects new files.
Interestingly, someone on IRC had the same issue 2 weeks or so ago (unless this was also you?) but the cause is unknown - as Adam says, if the file exists, we only run "rrdtool update" on it.
Tom
On 12/01/2014 13:13, Robert Williams wrote:
Hi, Thanks for that - however I find this interesting, the RRDs are a different size now compared to the restored versions: *For a normal port:* 1,078,896 port-10148.rrd.restore (the backup/restored version) 1,739,144 port-10148.rrd (the empty created at midnight version) *For netstats-icmp:* 1,218,600 netstats-icmp.rrd.restore (original) 3,013,472 netstats-icmp.rrd (new empty one) So an increase for every file occurred at midnight, we have nothing else running on this server, so no reason for something to go and pick out all similar hardware and delete their rrds. I then checked the rrd content and found a large difference in the rra/row sizes and the number of actual rra's: # rrdtool info port-10148.rrd.restore | grep .rows <- the *smaller* restored version from yesterday rra[0].rows = 2016 rra[1].rows = 2976 rra[2].rows = 1440 rra[3].rows = 1440 rra[4].rows = 1440 rra[5].rows = 360 rra[6].rows = 1440 rra[7].rows = 1440 rra[8].rows = 360 rra[9].rows = 1440 # rrdtool info port-10148.rrd | grep .rows <- the *larger* created-at-midnight version rra[0].rows = 2400 rra[1].rows = 1200 rra[2].rows = 1200 rra[3].rows = 1200 rra[4].rows = 600 rra[5].rows = 700 rra[6].rows = 775 rra[7].rows = 797 I've checked further back in time and the files have been the same (smaller) size for as far back as our backups go (several months) -- so something caused it to change the layout of the rrd file, only for these specific hosts, overnight. I'm a bit lost with this one, any ideas? *From:* observium [mailto:observium-bounces@observium.org] *On Behalf Of *Adam Armstrong *Sent:* 12 January 2014 11:51 *To:* Observium Network Observation System *Subject:* Re: [Observium] Sudden loss of history Observium doesn't have the ability to do this. Once the RRDs exist, it can't recreate them. Either they were removed or deleted, and were then recreated by observium. Adam.
Robert Williams Custodian Data Centre Email: Robert@CustodianDC.com http://www.CustodianDC.com
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