Hi, We have a Nautilus (14.2.9) Ceph cluster with two types of HDDs: - TOSHIBA MG07ACA14TE [1] - HGST HUH721212ALE604 [2] They're all bluestore OSDs with no separate DB+WAL and part of the same pool. We noticed that while the HGST OSDs have a commit latency of about 15ms, the Toshiba OSDs hover around 150ms (these values come from the `ceph_osd_commit_latency_ms` metric in Prometheus). On paper, it seems like those drives have very similar specs, so it's not clear to me why we're seeing such a large difference when it comes to commit latency. Has anyone had any experience with those Toshiba drives? Or looking at the specs, do you spot anything suspicious? And if you're running a Ceph cluster with various disk brands/models, have you ever noticed some of them standing out when looking at `ceph_osd_commit_latency_ms`? Thanks in advance for your feedback. Cheers, -- Ben [1]: https://toshiba.semicon-storage.com/content/dam/toshiba-ss/asia-pacific/docs/product/storage/product-manual/eHDD-MG07ACA-Product-Manual.pdf [2]: https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/product/data-center-drives/ultrastar-dc-hc500-series/data-sheet-ultrastar-dc-hc520.pdf _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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