one final word of warning for everyone.
while i no longer have the performance glitch.... I can no longer reproduce it. Doing ceph config set global rbd_cache true does not seem to reproduce the old behaviour. even if i do things like unmap and remap the test rbd. Which is worrying. because if I cant control the behaviour.... who is to say it wont mysteriously come back? ----- Original Message ----- From: "Philip Brown" <pbr...@medata.com> To: "Sebastian Trojanowski" <sebci...@gazeta.pl> Cc: "ceph-users" <ceph-users@ceph.io> Sent: Thursday, December 17, 2020 9:02:05 AM Subject: Re: [ceph-users] Re: performance degredation every 30 seconds I am happy to say, this seems to have been the solution. After running ceph config set global rbd_cache false I can now run the full 256 thread varient, fio --direct=1 --rw=randwrite --bs=4k --ioengine=libaio --filename=/dev/rbd0 --iodepth=256 --numjobs=1 --time_based --group_reporting --name=iops-test-job --runtime=120 --eta-newline=1 and there is no longer a noticeable performance dip. Thanks Sebastian _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
