> > I observed that on an otherwise idle cluster, scrubbing cannot fully > utilise the speed of my HDDs.
Maybe the configured limit is set like this, because of that once (a part of) the scrubbing process is started it is not possible/easy to automatically scale down the performance to benefit client io. > `iostat` shows only 8-10 MB/s per disk, instead of the ~100 MB/s most > HDDs can easily deliver. 100MB/s is sequential, your scrubbing is random. afaik everything is random. > Changing scrubbing settings does not help (see below). > I think you should be able to use the full performance of the disk when ceph tell osd.* injectargs '--osd_max_scrubs=X'. I never tried increasing the individual scrub speed, maybe such a setting is available ceph tell osd.* injectargs '--osd_recovery_sleep_hdd=0.100000' Best is to stick as much as possible to the defaults. _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
