On Wed, 11 Sep 2019 at 23:13, Vasu Kulkarni <vakulkar@redhat.com> wrote:
On Wed, Sep 11, 2019 at 10:38 AM Rishabh Dave <ridave@redhat.com> wrote:
Hello,
While working on CephFS Quick Start guide[1], the major issue that I came across was choosing the value for pg_num for the pools that will serve CephFS. I've tried the values from 4 to 128 for both data and metadata pools and have always got "undersized+peered" instead of "active+clean". Copying pg_num values from the cluster setup by vstart.sh (8 for data and 16 for metadata pools) gave me the same result.
About the cluster: I had a single node running Fedora 29 with 1 MON, 1 MGR, 1 MDS and 3 OSDs each with a disk size of 10 GB. Thinking that disk size might have a role to play, I changed the number of OSDs to 2 each with 20 GB disks and later with 50 GB disks but neither helped. I used dnf to install ceph and ceph-deploy to setup the cluster.
I've copied the the cluster status after every attempt here[2] in case that helps. Any suggestions about pg_num values I should choose and on the pg_num values that would be nice for a user looking forward to get quickly started with CephFS?
Why not recommend this in quick-start for master or from nautilus stable? https://ceph.com/rados/new-in-nautilus-pg-merging-and-autotuning/
Although, I could get "active+clean" for all PGs but not HEALTH_OK, it'll mention be great to mention this anyway. Thanks for pointing out.