Right, both Norman and I set the pg_num before the pgp_num. For example,
here is my current pool settings:
*"pool 40 '*redacted*.rgw.buckets.data' erasure size 9 min_size 7
crush_rule 2 object_hash rjenkins pg_num 2048 pgp_num 1024 pgp_num_target
2048 last_change 8458830 lfor 0/0/8445757 flags
hashpspool,ec_overwrites,nodelete,backfillfull stripe_width 24576 fast_read
1 application rgw"*
So, when I set:
"*ceph osd pool set hou-ec-1.rgw.buckets.data pgp_num 2048*"
it returns:
"*set pool 40 pgp_num to 2048*"
But upon checking the pool details again:
"*pool 40 '*redacted*.rgw.buckets.data' erasure size 9 min_size 7
crush_rule 2 object_hash rjenkins pg_num 2048 pgp_num 1024 pgp_num_target
2048 last_change 8458870 lfor 0/0/8445757 flags
hashpspool,ec_overwrites,nodelete,backfillfull stripe_width 24576 fast_read
1 application rgw*"
and the pgp_num value does not increase. Am I just doing something
totally wrong?
Thanks,
Mac Wynkoop
On Tue, Oct 6, 2020 at 2:32 PM Marc Roos <M.Roos@xxxxxxxxxxxxxxxxx> wrote:
> pg_num and pgp_num need to be the same, not?
>
> 3.5.1. Set the Number of PGs
>
> To set the number of placement groups in a pool, you must specify the
> number of placement groups at the time you create the pool. See Create a
> Pool for details. Once you set placement groups for a pool, you can
> increase the number of placement groups (but you cannot decrease the
> number of placement groups). To increase the number of placement groups,
> execute the following:
>
> ceph osd pool set {pool-name} pg_num {pg_num}
>
> Once you increase the number of placement groups, you must also increase
> the number of placement groups for placement (pgp_num) before your
> cluster will rebalance. The pgp_num should be equal to the pg_num. To
> increase the number of placement groups for placement, execute the
> following:
>
> ceph osd pool set {pool-name} pgp_num {pgp_num}
>
>
> https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/4/html/storage_strategies_guide/placement_groups_pgs
>
> -----Original Message-----
> To: norman
> Cc: ceph-users
> Subject: Re: pool pgp_num not updated
>
> Hi everyone,
>
> I'm seeing a similar issue here. Any ideas on this?
> Mac Wynkoop,
>
>
>
> On Sun, Sep 6, 2020 at 11:09 PM norman <norman.kern@xxxxxxx> wrote:
>
> > Hi guys,
> >
> > When I update the pg_num of a pool, I found it not worked(no
> > rebalanced), anyone know the reason? Pool's info:
> >
> > pool 21 'openstack-volumes-rs' replicated size 3 min_size 2 crush_rule
> > 21 object_hash rjenkins pg_num 1024 pgp_num 512 pgp_num_target 1024
> > autoscale_mode warn last_change 85103 lfor 82044/82044/82044 flags
> > hashpspool,nodelete,selfmanaged_snaps stripe_width 0 application rbd
> > removed_snaps
> > [1~1e6,1e8~300,4e9~18,502~3f,542~11,554~1a,56f~1d7]
> > pool 22 'openstack-vms-rs' replicated size 3 min_size 2 crush_rule 22
> > object_hash rjenkins pg_num 512 pgp_num 512 pg_num_target 256
> > pgp_num_target 256 autoscale_mode warn last_change 84769 lfor
> > 0/0/55294 flags hashpspool,nodelete,selfmanaged_snaps stripe_width 0
> > application rbd
> >
> > The pgp_num_target is set, but pgp_num not set.
> >
> > I have scale out new OSDs and is backfilling before setting the value,
>
> > is it the reason?
> > _______________________________________________
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> >
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