Symptoms
Core dump file, located at /var/core directory, gets deleted after experiencing the purple diagnostic screen on the ESXi host after 11 days.
Cause
This issue occurs because tmpwatch.py script, located at /sbin, removes files older than X hours/days and listed as a cronjob in /var/spool/cron/crontabs that is shipped with VMware vSphere ESXi.
Resolution
This is an expected behavior and is by design.Ensure that a diagnostic information is gathered from the ESX or ESXi host after it experiences a purple diagnostic screen.For more information, see Collecting diagnostic information from an ESX or ESXi host that experience a purple diagnostic screen (1004128).
Related Information
Interpreting an ESX/ESXi host purple diagnostic screenESXi ホストで紫色の診断画面が表示されてから 11 日経つと、生成されたコアダンプファイルが削除される
