scan_extents should not saturate links much because it doesn't read entire objects but only performs rados' stat() call on them which returns several bytes of data. You can learn about the scan progress by monitoring pool stats via 'rados df' or daemon metrics.
What type of bandwidth did you see during the recovery process? We are seeing around 2 Mbps on each box running 20 processes each. Although I was advised not to use caching during recovery, I didn't notice any improvements after disabling it.
> On 5.11.2018, at 17:32, Rhian Resnick <xantho@xxxxxxxxxxxx> wrote:
>
> We are running cephfs-data-scan to rebuild metadata. Would changing the cache tier mode of our cephfs data partition improve performance? If so what should we switch to?
>
> Thanks
>
> Rhian
>
>
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