Hello there, i have a Problem with my Server installation - here are some details:
- Ubuntu 18.04 LTS
- Server Version 2.4.12
- HP Microserver Gen8 - Celeron G1610 - 8 GB ECC Ram
- OS & Urbackupserver on SSD
- Backupdata on MDADM Raid 5 of 4x4 TB Seagate NAS HDD
- Beginning of the Problem: around April 5th (there was the last successfull Backups)
Problem:
the urbackup Server process crashes after a few minutes of running. the process start to backup data from the clients and stops with a memory error.
Solutions / Troubleshooting:
- Ram Error? -> Memtest runs for 4 Hours with 3 passes and 0 errors
- Disk problems? -> smartctl reports all disks as PASSED; data write (sync) and read operations are alle functional within the normal range
- OS Problem? -> updated from 16.04 LTS to 18.04 LTS
What I see: When the Process crashes, around 7GB of my 8GB Ram are use for Caching or Buffer. But i dont know if this is the normal way 
In the Serverlogs i cant find any hints or errors…so i hope some of you have some suggestions for me
greetings Andreas