On Wed, Oct 9, 2019 at 10:45 AM Jeremi Avenant <jer...@idia.ac.za> wrote:
> Good morning > > Q: Is it possible to have a 2nd cephfs_data volume and exposing it to the > same openstack environment? > yes, see documentation for cephfs layouts: https://docs.ceph.com/docs/master/cephfs/file-layouts/ > > Reason being: > > Our current profile is configured with erasure code value of k=3,m=1 (rack > level) but we looking to buy another +- 6PB of storage w/ controllers and > was thinking of moving to an erasure profile of k=2,m=1 since we're not so > big on data redundancy but more on disk space + performance. > Your new configuration uses *more* space than the old one. Also, m=1 is a bad idea. > For what I understand you can't change erasure profiles, therefor we need > to essentially build a new ceph cluster but we're trying to understand if > we can attach it to the existing openstack platform, then gradually move > all the data over from the old cluster into the new cluster, destroy the > old cluster and integrated it with the new one. > No, you can just create a new directory in cephfs in the new pool, see layout documentation linked above > > If anyone has any recommendations to get more space out + performance at > the cost of data redundancy with at least 1 rack please let me know as > well. > Depends on how many racks you have. Common erasure coding setups are 4+2 for low redundancy and something like 8+3 for higher redundancy. I'd never run a production setup with x+1 (but I guess it does depend on how much you care about availability vs. durability) Paul > > Regards > -- > > > > > *Jeremi-Ernst Avenant, Mr.*Cloud Infrastructure Specialist > Inter-University Institute for Data Intensive Astronomy > 5th Floor, Department of Physics and Astronomy, > University of Cape Town > > Tel: 021 959 4137 <0219592327> > Web: www.idia.ac.za <http://www.uwc.ac.za/> > E-mail (IDIA): jer...@idia.ac.za <mfu...@idia.ac.za> > Rondebosch, Cape Town, 7600 > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io > To unsubscribe send an email to ceph-users-le...@ceph.io >
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