On Sun, Oct 23, 2016 at 10:45 PM, David Turner < david.tur...@storagecraft.com> wrote:
> 1/3 of your raw data on the osds will be deleted and then it move a bunch > around. I haven't done it personally, but I would guess somewhere in the > range of 50-70% data movement. It will depend on how many pgs you have, > failure domains (hosts by default), etc. > Maybe I'm seriously misremembering how this works, but I would not expect any data movement solely as the result of a pool reducing its size (replica count). Everything will have to re-peer but otherwise it should just remove OSDs from the up/acting sets. Obviously *increasing* the size means you'll have to re-replicate and that will do all kinds of things, but it still won't be a rebalance — just lots and lots of data being sent across the network to up the replica counts. -Greg > > Sent from my iPhone > > > > On Oct 23, 2016, at 9:56 AM, Sebastian Köhler <s...@tyrion.de> wrote: > > > > Thanks for the help, is there any information available on how much data > > movement will happen when I reduce the size from 3 to 2? The min_size is > > already at 1. > > > >> On 10/23/2016 05:43 PM, David Turner wrote: > >> Make sure to also adjust your min_size. Having those be the same number > >> can cause issues if and when you lose an osd from your cluster. > >> > >> Like Wido said, you can change the size of a replica pool at any time, > >> it will just cause a lot of data to move. > >> > >> Sent from my iPhone > >> > >>> On Oct 23, 2016, at 4:30 AM, Wido den Hollander <w...@42on.com> wrote: > >>> > >>> > >>>> Op 23 oktober 2016 om 10:04 schreef Sebastian Köhler <s...@tyrion.de>: > >>>> > >>>> > >>>> Hello, > >>>> > >>>> is it possible to reduce the replica count of a pool that already > >>>> contains data? If it is possible how much load will a change in the > >>>> replica size cause? I am guessing it will do a rebalance. > >>>> > >>> > >>> Yes, just change the 'size' parameter of the pool. Data will rebalance > >> indeed if you increase the number. > >>> > >>> Wido > >>> > >>>> Thanks > >>>> > >>>> Sebastian > >>>> > >>>> > >> > >> ------------------------------------------------------------ > ------------ > >> > >> <https://storagecraft.com> David Turner | Cloud Operations Engineer > | > >> StorageCraft Technology Corporation <https://storagecraft.com> > >> 380 Data Drive Suite 300 | Draper | Utah | 84020 > >> Office: 801.871.2760| Mobile: 385.224.2943 > >> > >> ------------------------------------------------------------ > ------------ > >> > >> If you are not the intended recipient of this message or received it > >> erroneously, please notify the sender and delete it, together with any > >> attachments, and be advised that any dissemination or copying of this > >> message is prohibited. > >> > >> ------------------------------------------------------------ > ------------ > >> > >> > > ------------------------------ > > <https://storagecraft.com> David Turner | Cloud Operations Engineer | > StorageCraft > Technology Corporation <https://storagecraft.com> > 380 Data Drive Suite 300 | Draper | Utah | 84020 > Office: 801.871.2760 | Mobile: 385.224.2943 > > ------------------------------ > > If you are not the intended recipient of this message or received it > erroneously, please notify the sender and delete it, together with any > attachments, and be advised that any dissemination or copying of this > message is prohibited. > > ------------------------------ > > _______________________________________________ > >>>> ceph-users mailing list > >>>> ceph-users@lists.ceph.com > >>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >>> _______________________________________________ > >>> ceph-users mailing list > >>> ceph-users@lists.ceph.com > >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >> > > > > _______________________________________________ > > ceph-users mailing list > > ceph-users@lists.ceph.com > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >
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