This is what Jean suggested. I understand it and it works with primary. *But what I need is for all clients to access same files, not separate sets (like red blue green)*
Thanks Konstantin. On Fri, Nov 16, 2018 at 3:43 AM Konstantin Shalygin <k0...@k0ste.ru> wrote: > On 11/16/18 11:57 AM, Vlad Kopylov wrote: > > Exactly. But write operations should go to all nodes. > > This can be set via primary affinity [1], when a ceph client reads or > writes data, it always contacts the primary OSD in the acting set. > > > If u want to totally segregate IO, you can use device classes: > > Just create osds with different classes: > > dc1 > > host1 > > red osd.0 primary > > blue osd.1 > > green osd.2 > > dc2 > > host2 > > red osd.3 > > blue osd.4 primary > > green osd.5 > > dc3 > > host3 > > red osd.6 > > blue osd.7 > > green osd.8 primary > > > create 3 crush rules: > > ceph osd crush rule create-replicated red default host red > > ceph osd crush rule create-replicated blue default host blue > > ceph osd crush rule create-replicated green default host green > > > and 3 pools: > > ceph osd pool create red 64 64 replicated red > > ceph osd pool create blue 64 64 replicated blue > > ceph osd pool create blue 64 64 replicated green > > > [1] > > http://docs.ceph.com/docs/master/rados/operations/crush-map/#primary-affinity > ' > > > > k > >
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