[ceph-users] speeding up ceph

Sergey Malinin hell at newmail.com
Mon Nov 5 10:09:09 PST 2018


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.


> On 5.11.2018, at 20:02, Rhian Resnick <xantho at sepiidae.com> wrote:
> 
> What type of bandwidth did you see during the recovery process? We are seeing around 2 Mbps on each box running 20 processes each.
> 
> On Mon, Nov 5, 2018 at 11:31 AM Sergey Malinin <hell at newmail.com <mailto:hell at newmail.com>> wrote:
> 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 at sepiidae.com <mailto:xantho at sepiidae.com>> 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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