Hi Maged,
I just want to make sure if I understand how ceph client read from cluster.So
with current version of ceph(12.2.2) the client only read from the primary
osd(one copy),is that true?
2018-01-27
lin.yunfan
发件人：Maged Mokhtar <mmokh...@petasan.org>
发送时间：2018-01-26 20:27
主题：Re: [ceph-users] How ceph client read data from ceph cluster
收件人："shadow_lin"<shadow_...@163.com>
抄送："ceph-users"<ceph-users@lists.ceph.com>
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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