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#storage
2 posts
Systems debugging
10 minWhat is putting those bytes on the wire?
The storage interface on a production cluster was pulling 4 to 12x more than the public interface where client requests arrive. Getting to a defensible number meant distrusting everything, including my own profiler, which was off by 30x.
#ceph#ebpf#linux#kernel
Systems debugging
7 minA Ceph cluster I throw away on every reboot
I wanted a real Ceph endpoint (S3, CephFS, RBD) to test app code against, without a k8s cluster or a single byte hitting my SSD. One container, ~30 seconds, all in RAM. The version sweep is where it got interesting.
#ceph#storage#docker#tmpfs