On 2018-01-26 09:09, shadow_lin wrote:
> Hi List,
> I read a old article about how ceph client read from ceph cluster.It said the
> client only read from the primary osd. Since ceph cluster in replicate mode
> have serveral copys of data only read from one copy seems waste the
> performance of concurrent read from all the copys.
> But that artcile is rather old so maybe ceph has imporved to read from all
> the copys? But I haven't find any info about that.
> Any info about that would be appreciated.
> Thanks
>
> 2018-01-26
> -------------------------
> shadow_lin
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Hi
The majority of cases you will have more concurrent io requests than
disks, so the load will already be distributed evenly. If this is not
the case and you have a large cluster with fewer clients, you may
consider using object/rbd striping so each io will be divided into
different osd requests.
Maged
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