> 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.
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