> On Nov 13, 2025, at 12:25 PM, Matthias Riße <[email protected]> wrote: > > Hey Patrick! Thanks, that's very insightful. > > We also have HDDs only and 25Gb/s ethernet between the machines, so similar > to your setup, except we have >=8 disks per machine. > > Your workload seems more sequential than what I am expecting from our VMs, so > maybe that favors EC for you.
OSDs usually see a random workload regardless, the IO blender effect. > Out of curiosity, did you try the same benchmarks with 3x replication too? > > The raw numbers look promising, what I am seeing currently is about 350MB/s > max sequential writes with the local RAID6's we have, which Ceph was able to > saturate with a single OSD on a LV for testing. You already get about double > of that, and we have twice as many disks, so should get even more. > > Have you tried 8+4 or 7+5 with 3 OSDs per host too? > > -- > --------------------------------------------------------------------------------------------- > --------------------------------------------------------------------------------------------- > Forschungszentrum Jülich GmbH > 52425 Jülich > Sitz der Gesellschaft: Jülich > Eingetragen im Handelsregister des Amtsgerichts Düren Nr. HR B 3498 > Vorsitzender des Aufsichtsrats: MinDir Stefan Müller > Geschäftsführung: Prof. Dr. Astrid Lambrecht (Vorsitzende), > Dr. Stephanie Bauer (stellvertretende Vorsitzende), > Prof. Dr. Ir. Pieter Jansens, Prof. Dr. Laurens Kuipers > --------------------------------------------------------------------------------------------- > --------------------------------------------------------------------------------------------- > _______________________________________________ > ceph-users mailing list -- [email protected] > To unsubscribe send an email to [email protected] _______________________________________________ ceph-users mailing list -- [email protected] To unsubscribe send an email to [email protected]
