VMs on erasure coded SSDs with fast_read work fine since 12.2.2. Paul
Am Sa., 8. Sep. 2018 um 18:17 Uhr schrieb David Turner <[email protected]>: > > I tested running VMs on EC back in Hammer. The performance was just bad. I > didn't even need much io, but even performing standard maintenance was > annoying enough that I abandoned the idea. I didn't really try to tweak > settings to make it work and I only had a 3 node cluster running 2+1. I did > use it for write once/read many data volumes which worked great. I eventually > moved away from that on RBDs and migrated into EC on CephFS once that became > stable in Jewel. Now on Luminous I've even been able to remove the cache tier > I once had in front of all of the EC things. > > On Fri, Sep 7, 2018, 5:19 PM Maged Mokhtar <[email protected]> wrote: >> >> On 2018-09-07 13:52, Janne Johansson wrote: >> >> >> >> Den fre 7 sep. 2018 kl 13:44 skrev Maged Mokhtar <[email protected]>: >>> >>> >>> Good day Cephers, >>> >>> I want to get some guidance on erasure coding, the docs do state the >>> different plugins and settings but to really understand them all and their >>> use cases is not easy: >>> >>> -Are the majority of implementations using jerasure and just configuring k >>> and m ? >> >> >> Probably, yes >> >>> >>> -For jerasure: when/if would i need to change >>> stripe_unit/osd_pool_erasure_code_stripe_unit/packetsize/algorithm ? The >>> main usage is rbd with 4M object size, the workload is virtualization with >>> average block size of 64k. >>> >>> Any help based on people's actual experience will be greatly appreciated.. >>> >>> >> >> Running VMs on top of EC pools is possible, but probably not recommended. >> All the random reads and writes they usually cause will make EC less >> suitable than replicated pools, even if it is possible. >> >> -- >> May the most significant bit of your life be positive. >> >> Point well taken...it could be useful for backing up vms, and maybe vms >> without too much latency requirements if k and m are not large. >> >> _______________________________________________ >> ceph-users mailing list >> [email protected] >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- Paul Emmerich Looking for help with your Ceph cluster? Contact us at https://croit.io croit GmbH Freseniusstr. 31h 81247 München www.croit.io Tel: +49 89 1896585 90 _______________________________________________ ceph-users mailing list [email protected] http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
