Adding dev@xxxxxxx On Thu, 21 Nov 2019, Muhammad Ahmad wrote: > While trying to research how crush maps are used/modified I stumbled > upon these device classes. > https://ceph.io/community/new-luminous-crush-device-classes/ > > I wanted to highlight that having nvme as a separate class will > eventually break and should be removed. > > There is already a push within the industry to consolidate future > command sets and NVMe will likely be it. In other words, NVMe HDDs are > not too far off. In fact, the recent October OCP F2F discussed this > topic in detail. > > If the classification is based on performance then command set > (SATA/SAS/NVMe) is probably not the right classification. I opened a PR that does this: https://github.com/ceph/ceph/pull/31796 I can't remember seeing 'nvme' as a device class on any real cluster; the exceptoin is my basement one, and I think the only reason it ended up that way was because I deployed bluestore *very* early on (with ceph-disk) and the is_nvme() detection helper doesn't work with LVM. That's my theory at least.. can anybody with bluestore on NVMe devices confirm? Does anybody see class 'nvme' devices in their cluster? Thanks! sage
