On Wed, 11 Sep 2019, Rishabh Dave 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
This is unrelated to the PGs or the capacity--the problem is that you have
a single node, and the default CRUSH rule replicates across hosts.
That's why your pools are unhealthy.
You can fix this by creating a new crush rule with 'osd' instead of
'host' as the failure domain, and then setting your pool(s) to use that
rule.
osd crush rule create-replicated <name> <root> create crush rule <name> for replicated pool to
<type> {<class>} start from <root>, replicate across buckets of
type <type>, use devices of type <class> (ssd
or hdd)
osd pool set <poolname> crush_rule <rule-name>
sage
> 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?
>
> [1] https://docs.ceph.com/docs/master/start/quick-cephfs/
> [2] https://paste.fedoraproject.org/paste/Q-WH8VWtwu6JwF7eW2JmnA
>
> Thanks,
> - Rishabh
> _______________________________________________
> Dev mailing list -- dev@xxxxxxx
> To unsubscribe send an email to dev-leave@xxxxxxx
>
>
_______________________________________________
Dev mailing list -- dev@xxxxxxx
To unsubscribe send an email to dev-leave@xxxxxxx
