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AMD Disk Capacity



can you advise me how can I determine how much AMD capacity I need for the DC RUM deployment? Is there for example some calculator or something like that?

We have the DC RUM deployment and on the AMDs we have 800 GB but partition /var/spool/adlex is still growing up and I think 800 GB will not be enough. Which data are saved to /var/spool/adlex?




Hi Jakub,

Have you checked if your AMD were generating core dumps?

How much traffic are you analyzing on this probe?

We have about 300Go hard drives on our probes for the whole machine and they are far from being full!



Hi Sandrine,

we are analyzing about 12G traffic per day on one probe.

Generating of core dumps have not been checked. What does it mean if they are there or not?



Jakub - don't worry.

There are couple of things to have in mind and as Sandrine says, you should have enough.

The reason is that there is support process that keeps a minimum of space free, then it starts to clean up oldest data. I was looking for an older post (can't find it) about the process but I "Think" it aims to keep ~20% free disk.

The datacleaner.config file Adam mentioned above, contains this value, 20% is correct (at least for the AMD I just checked).

It'll try to keep 8 days (192 hours in the config file), but will purge older data to keep 20% free space.

Dynatrace Pro
Dynatrace Pro


Answering your questions:

  • No, there is no way to calculate the HD needed as it strictly depends on the configuration - you can configure AMD in the way that would fill almost each drive. The most important factors in here are:

    • number of days you keep data for on the AMD HD (/usr/adlex/config/datacleaner.config file),
    • the type of data files enabled - I saw really huge vdatas and headerdatas ...
    • configuration that influences data files size:

      • autodiscovery turned on,
      • URL auto learning turned off,
      • HW/Browser/Os recognition turned off,
      • many SSes that do not have URL auto learning and report just everything,
  • /var/spool/adlex contains mostly data files in /var/spool/adlex/rtm that are read by CAS/ADS and captures used by RUM Console in /var/spool/adlex/cba folder.

As Sandrine mentioned it good idea to check /usr/adlex/rtm/bin and /usr/adlex/cba/bin folders for files. Make sure /usr/adlex/config/rtm.config is set up to keep only one core file, otherwise it may flood the HD and start eating data files. It's because of the process mentioned by Ulf called datacleaner configured in /usr/adlex/config/datacleaner.config file - by default it makes sure the HD has 20% of free space by deleting the oldest data files only from /var/spool/adlex/rtm.

If your AMD configuration produces big data files make sure you need this config and/or if you need default 8 days of data files to be stored on the AMD HD. As they're meant to be read constantly by report servers you should keep then as long as AMD <-> CAS/ADS link might be down ...

Hello Adam,

Recently the same issue started with one of our AMD and its started
eating HD rapidly.

I had gone through with all your mentioned steps to find out the
root cause of this behavior and I found that each AMD primary data source has 3
core files in /usr/adlex/cba/bin and one core file in /usr/adlex/rtm/bin in all
AMDs primary and secondary data sources.

Our current scenario is that we
have 4 AMDs. Two AMDs are primary data sources and 2 are secondary data sources
to our CAS/ADS server.

One AMD pair is working fine but the other is going to finish HD
sooner. We are feeding almost the same volume of traffic to both AMDs.

Please guide
to me resolve this issue before going into big trouble.




Which line should we change or add into the RTM.config file to limit the core dump to the last ?

In /usr/adlex/config/rtm.config


Will set to retain only the most recent RTM core

In /usr/adlex/config/cba.config.xml

the <maxCoreDumps> parameter will control the number of CBA cores

-- Erik


Hi all,

today I checked both folders which mentioned Adam for files. I do not see any file in those folders. Screen of the content of /usr/adlex/rtm/bin folder is attached.

Now we have only 10% free space of overall 800 GB disk space.




Please share the output of the following two commands:

du -h --max-depth=1 /var/spool/adlex/ | sort -n -r

and :

ls -halt /var/spool/adlex/rtm/ | head -n20

as it looks like you just have big data files.


the outputs are here:

pprumamd@prumas02:~$ du -h --max-depth=1 /var/spool/adlex/ | sort -n -r
du: cannot read directory `/var/spool/adlex/avagt': Permission denied
564G /var/spool/adlex/
552G /var/spool/adlex/rtm
90M /var/spool/adlex/nfc
16K /var/spool/adlex/lost+found
12G /var/spool/adlex/cba
4.0K /var/spool/adlex/smtp
4.0K /var/spool/adlex/debug
4.0K /var/spool/adlex/avagt


pprumamd@prumas02:~$ ls -halt /var/spool/adlex/rtm/ | head -n20
total 552G
-rw-r----- 1 pprumamd pprumamd 4.7M Dec 4 11:17 hpdata_
-rw-r----- 1 pprumamd pprumamd 5.5K Dec 4 11:17 cbastatsdata_5661681c_1_t
-rw-r----- 1 pprumamd pprumamd 12M Dec 4 11:17 vdata_
-rw-r----- 1 pprumamd pprumamd 1.9M Dec 4 11:17 dtdata-102977743_
-rw-r----- 1 pprumamd pprumamd 792 Dec 4 11:17 systemstatsdata_5661681c_1_t
drwxr-x--- 2 pprumamd pprumamd 45M Dec 4 11:17 .
-rw-r----- 1 pprumamd pprumamd 25K Dec 4 11:17 amdstatsdata_566167e0_1_t
-rw-r----- 1 pprumamd pprumamd 49K Dec 4 11:17 gatestatsdata_5661681c_1_t
-rw-r----- 1 pprumamd pprumamd 573 Dec 4 11:16 transdata_566167a4_5_t
-rw-r----- 1 pprumamd pprumamd 210 Dec 4 11:16 page2transmap_566167a4_5_t
-rw-r----- 1 pprumamd pprumamd 4.3K Dec 4 11:16 cpdata_566167a4_5_t
-rw-r--r-- 1 root root 1.3K Dec 4 11:16 cbaagentstatsdata_566167e0_1_t
-rw-r----- 1 pprumamd pprumamd 161K Dec 4 11:16 rtmstatsdata_566167e0_1_t
-rw-r----- 1 pprumamd pprumamd 5.5K Dec 4 11:16 cbastatsdata_566167e0_1_t
-rw-r----- 1 pprumamd pprumamd 792 Dec 4 11:16 systemstatsdata_566167e0_1_t
-rw-r----- 1 pprumamd pprumamd 25K Dec 4 11:16 amdstatsdata_566167a4_1_t
-rw-r----- 1 pprumamd pprumamd 49K Dec 4 11:16 gatestatsdata_566167e0_1_t
drwx------ 9 pprumamd pprumamd 4.0K Dec 4 11:15 ..
-rw-r----- 1 pprumamd pprumamd 161K Dec 4 11:15 rtmstatsdata_566167a4_1_t



Data files looks to be the biggest factor, but the second command looks to be too short to give us the ideas, let's continue in the ticket ...


If you go to the root and do "du -h -c" , you will get a nice long listing of the directories and how much space they occupy.


Hi all,

we reached 90% of disk capacity so it seems that datacleaner process does not work properly. Rather, I will contact DT support.



Hi all,

the issue is resolved!

During the installation of DC RUM, customer had specific requirement to install and run the DC RUM under application user "pprumamd" who has sudo privileges to some commands only. We also cannot run crons under root but under our app user. However, we did not know that in adlexcron_run15min "nice" command is used and app user has not privileges for "nice".

Our resolution is to remove "nice" command and run the datacleaner without it.