Am 19.07.2018 um 05:57 schrieb Konstantin Shalygin: >> Now my first question is: >> 1) Is there a way to specify "take default class (ssd or nvme)"? >> Then we could just do this for the migration period, and at some point remove "ssd". >> >> If multi-device-class in a crush rule is not supported yet, the only workaround which comes to my mind right now is to issue: >> $ ceph osd crush set-device-class nvme <old_ssd_osd> >> for all our old SSD-backed osds, and modify the crush rule to refer to class "nvme" straightaway. > > > My advice is to set class to 'nvme' to your current osd's with class 'ssd' and change crush rule to this class. > > You still have to do it, better sooner than later.Either use the ssd class for your future drives, in case when you switch all your ssd to nvme and forgot about ssd disks. Yes, this sounds good. I'll schedule this for as soon as we have a small I/O pause in any case, just to be sure this will not interfere with ongoing I/O. Changing the old devices and the crush rule sounds like the best plan, then all future NVMEs will be handled correctly without any manual intervention. > > >> Here my third question: >> 3) Are the tunables used for NVME devices the same as for SSD devices? >> I do not find any NVME tunables here: >> http://docs.ceph.com/docs/master/rados/configuration/osd-config-ref/ >> Only SSD, HDD and Hybrid are shown. > > Ceph is doesn't care about nvme/ssd. Ceph is only care is_rotational drive or not. > > > "bluefs_db_rotational": "0", > "bluefs_slow_rotational": "1", > "bluefs_wal_rotational": "0", > "bluestore_bdev_rotational": "1", > "journal_rotational": "0", > "rotational": "1" > Ah, I see! So those tunables (osd recovery sleep ssd, osd recovery sleep hdd, osd recovery sleep hybrid, and the other sleep parameters) just have a misleading name ;-). Thanks and all the best, Oliver > > > k >
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