The Cache HIt Ratio in the Dashboard is in contrast of the figures calculated

[#1]

One of the clients has calculated the Cache hit ratio to be around 5% while the CHR graph on the Infoblox DDI appliance suggests 90%. His calculation formula does not look right to me. Please have a look.

O

(  calculated the cache hit ratio and QPS from available statistics in sys log and with the help of shared formula.

And found cache hit ratio is near about only 5% while in system generated graph all the time it shows near about 90%, Please find the attached snap shot for your reference.

AND also QPS is near about 500/sec.)

Here is for your information.

Appliance logs a statistics message per recursive view every 5 minutes. A sample log snippet: 2012-12-11T14:45:42+01:00 daemon (none) named[5367]: info Recursion cache view "_default": size = 78792936, hits = 324428822, misses = 267529683 2012-12-11T14:50:42+01:00 daemon (none) named[5367]: info Recursion cache view "_default": size = 78759408, hits = 324429493, misses = 267624339 Delta hits : 324429493-324428822 = 671 Delta misses : 267624339-267529683 = 94656 Total CHR (Cache Hit Ratio) in last 300 seconds is: 671/(671+94656) * 100 = .70 The QPS would be = (Delta Misses + Delta Hits)/ Delta Time

4:43 PM

THIS IS ABT FORMULA

[#2 · Accepted solution]

Wasfi, can you re-upload the images, or send them to community@infoblox.com and I'll upload.  Will work toward getting you a response.

Best,

Eric

[#3]