Storage

A screenshot of a Grafana time series plot. It shows the time between 23:30 and 09:00 for the throughput of my Ceph cluster. It tops out at almost 100 MB, but is on average more around 65 MB. The high throughput happens between approximately 00:00 and 08:50.

Ceph: My Story of Copying 1.7 TB from one Cluster to Another

A couple of weeks ago, I migrated my Jellyfin instance to my Kubernetes cluster. This involved copying my approximately 1.7 TB worth of media from the baremetal Ceph cluster to the new Rook Ceph cluster. And I’d like to dig a bit into the metrics and try to read them like the entrails of a slain beast during a full moon at the top of a misty mountain. Just this much, the portents don’t look good for one of my HDDs. ...

Migrating two Ceph OSDs from one physical hosts to another

Over the weekend, I migrated one of the Ceph VMs in my Homelab over to a physical host. This time around, instead of buying a completely new machine, I recycled most of my old 2018 era home server. It’s an old AMD A10-9700E, meaning the 35W TDP variant. I have noted some thoughts on reusing this old machine here. Mounted in the rack, the machine looks like this: Server mounted in the rack, without Ceph OSD disks attached. ...