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AMD vs CAS relation

henk_stobbe
Mentor

Who can tell me if I am right:


 


If the CAS is down the AMD buffers received  data: until /var/spool is full, or the CAS comes back online. If the CAS is down for a limited periode of time no data is lost.


If the AMD is down, data is lost.


If you remove all data from the /var/spool on the AMD, the CAS does not loose any data because it is in his database. A small amount of data can get lost because it is not send to the CAS yet,


Does this make sense?


 


 

3 REPLIES 3

adam_piotrowicz
Dynatrace Pro
Dynatrace Pro

In general you're right, and only the first sentence should be commented.

AMD stores data files in /var/spool/adlex/rtm folder for defined number of hours (by default 192 = 8 days, configured in /usr/adlex/config/datacleaner.config) or until there is only 20% or 100MB of free space on HD (it's configurable in /usr/adlex/config/datacleaner.config, using "minFreeSize.percent" and "minFreeSize.value" properties).

The fact that CAS gets back online does not change it. So if your CAS is down for > 8days you will start loosing data.

Adam, thanks!

Adam_Tryba
Dynatrace Advisor
Dynatrace Advisor

Just as addition to what Adam stated - AMD will never preserve data for more days than configured.
The min. free space and min. % of free space can only shorten that period (in case when those exemplary 8 days of data occupy to much space).