Hi, i just started the mongod service on mongo200 after crash. the crash happend beacuse of an so called page invalidation error were buffered io and direct io had a conflict. this error happend the third time. A possible fix for this in near future could be to upgrade the mongo server version on mongo100 and mongo200, this is now possible since the adjustments from Sören to the php mongo driver. Also the daily defragmentation proces wouldnt be needed because of the use of the more modern wiredtiger engine from mongodb. A solution for the far future could be to migrate the data from mongodb to elasticsearch due to better scalability, performance, maintenance and possible visualisations we can create from this data with elasicearch for customers. BR -- Mit freundlichen Grüßen Denny Gommel - Systemadministration - _______________________________________________ TraSo GmbH Nonnenstraße 42 04229 Leipzig Tel.: +49 341 / 355 740 -73 Fax: +49 341 / 355 740 -21 E-Mail: d.gommel@traso.de Internet: https://www.traso.de GPGP: 0xB1300DEE _______________________________________________ Geschäftsführer: Haiko Gerdes Handelsregister: Amtsgericht Leipzig (HRB 21850)