Ceph 10.2/Jewel and Xen on Debian Jessie

When using rbd as backend and updating to ceph Jewel, make sure you install qemu-system-x86, qemu-utils and qemu-block-extra from backports (version 2.5), else you might experience virtual machines booting without attached storage. In the /var/log/xen/qemu-dm-.log zu will find errors like these: xen be core: xen be: watching backend path (backend/console/3) failed xen be core: xen …

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Downtime

The website was offline fr a few hours several times in the past weeks. The mainboard of the server has been replaced now, so I hope the service is stable again. Update 19.02: Today a harddisk failed an needed replacement…

Cronjob to enable timed deep scrubbing in a ceph-cluster

If you have a ceph-cluster that has deterministic IO-patterns, you might want to time the deep-scrubbing during a period with lower IO activity. Probesys had published a script that could run from cron and deep-scrub the oldest n percent of the PGs. Unfortunately with newer ceph versions the output of some commands has changed. So …

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