We've also seen some problems with FileStore on newer kernels; 4.9 is the last kernel that worked reliably with FileStore in my experience.
But I haven't seen problems with BlueStore related to the kernel version (well, except for that scrub bug, but my work-around for that is in all release versions). Paul -- Paul Emmerich Looking for help with your Ceph cluster? Contact us at https://croit.io croit GmbH Freseniusstr. 31h 81247 München www.croit.io Tel: +49 89 1896585 90 On Mon, Jan 6, 2020 at 8:44 PM Jelle de Jong <jelledej...@powercraft.nl> wrote: > Hello everybody, > > I have issues with very slow requests a simple tree node cluster here, > four WDC enterprise disks and Intel Optane NVMe journal on identical > high memory nodes, with 10GB networking. > > It was working all good with Ceph Hammer on Debian Wheezy, but I wanted > to upgrade to a supported version and test out bluestore as well. So I > upgraded to luminous on Debian Stretch and used ceph-volume to create > bluestore osds, everything went downhill from there. > > I went back to filestore on all nodes but I still have slow requests and > I can not pinpoint a good reason I tried to debug and gathered > information to look at: > > https://paste.debian.net/hidden/acc5d204/ > > First I thought it was the balancing that was making things slow, then I > thought it might be the LVM layer, so I recreated the nodes without LVM > by switching from ceph-volume to ceph-disk, no different still slow > request. Then I changed back from bluestore to filestore but still the a > very slow cluster. Then I thought it was a CPU scheduling issue and > downgraded the 5.x kernel and CPU performance is full speed again. I > thought maybe there is something weird with an osd and taking them out > one by one, but slow request are still showing up and client performance > from vms is really poor. > > I just feel a burst of small requests keeps blocking for a while then > recovers again. > > Many thanks for helping out looking at the URL. > > If there are options which I should tune for a hdd with nvme journal > setup please share. > > Jelle > _______________________________________________ > ceph-users mailing list > email@example.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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