> > This is an expected result, and it is not specific to Ceph. Any > storage that consists of multiple disks will produce a performance > gain over a single disk only if the workload allows for concurrent use > of these disks - which is not the case with your 4K benchmark due to > the de-facto missing readahead. I don't think that affects writes. > To allow for faster linear reads and writes, please create a file, > /etc/udev/rules.d/80-rbd.rules, with the following contents (assuming > that the VM sees the RBD as /dev/sda): I think the OP didn't say that the client is a VM. It might be, it might be a KRBD mount, it might be through CSI, we don't know. I asked the OP privately if it's a VM because the first thing I check in this situation is libvirt / librbd throttling. It sounds a *lot* like saturating an IOPS client throttle, something I've seen time and again in virtualization scenarios. _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
 |