Hi Marc, Thanks for your prompt response. We have test the direct random write for the disk (without Ceph) and it is 200 MB/s. Wonder why we got 80MB/s from Ceph. Your help is much appreciated. Regards, Behzad On Sun, Jan 16, 2022 at 11:56 AM Marc <Marc@xxxxxxxxxxxxxxxxx> wrote: > > > > Detailed (somehow) problem description: > > Disk size: 1.2 TB > > Ceph version: Pacific > > Block size: 4 MB > > Operation: Sequential write > > Replication factor: 1 > > Direct disk performance: 245 MB/s > > Ceph controlled disk performance: 80 MB/s > > you are comparing sequential io against random. You should consider that > ceph writes to the drive in a 'random manner' > > > Sorry for asking this dummy question as I know there are numerous > > parameters affecting the performance. > > Yes this is written about everywhere on this list. > > _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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