Hi Jon, On 25 April 2018 at 21:20, Jonathan Proulx <jon@xxxxxxxxxxxxx> wrote: > > here's a snap of 24hr graph form one server (others are similar in > general shape): > > https://snapshot.raintank.io/dashboard/snapshot/gB3FDPl7uRGWmL17NHNBCuWKGsXdiqlt That's what, a median IOPs of about 80? Pretty high for spinning disk. I'd guess you're seeing write-choking. You might be able to improve things a bit by upping your librbd cache size (though obviously that would only have an effect on new or reset instances), also perhaps double check your block queue scheduler max_sectors_kb inside a guest and make sure you're not splitting up all writes into 512 byte chunks. But does kinda look like you need more hardware, and fast. -- Cheers, ~Blairo _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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