Yes, if I change the pg_num on current pool, cluster rebalance start.. Alternatively - I plan to do as below: 1. Createa a new pool with max possible pg_num (as per the pg calc). 2. Copy the current pool to new pool (during this step - IO should be stopped) 3. Rename the curent pool current.old and rename the new pool to current pool.
After 3rd step - I guess, cluster should be fine without rebalance. Thanks Swami On Thu, Feb 4, 2016 at 11:38 AM, Somnath Roy <somnath....@sandisk.com> wrote: > You can increase it, but, that will trigger rebalancing and based on the > amount of data it will take some time before cluster is coming into clean > state. > Client IO performance will be affected during this. > BTW this is not really an error , it is a warning because performance on that > pool will be affected because of low pg count. > > Thanks & Regards > Somnath > -----Original Message----- > From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of M > Ranga Swami Reddy > Sent: Wednesday, February 03, 2016 9:48 PM > To: Ferhat Ozkasgarli > Cc: ceph-users > Subject: Re: [ceph-users] Fwd: HEALTH_WARN pool vol has too few pgs > > Current pg_num: 4096. As per the PG num formula, no OSD * 100/pool size -> > 184 * 100/3 = 6133, so I can increase to 8192. Is this solves the problem? > > Thanks > Swami > > On Thu, Feb 4, 2016 at 2:14 AM, Ferhat Ozkasgarli <ozkasga...@gmail.com> > wrote: >> As message satates, you must increase placement group number for the pool. >> Because 108T data require larger pg mumber. >> >> On Feb 3, 2016 8:09 PM, "M Ranga Swami Reddy" <swamire...@gmail.com> wrote: >>> >>> Hi, >>> >>> I am using ceph for my storage cluster and health shows as WARN state >>> with too few pgs. >>> >>> == >>> health HEALTH_WARN pool volumes has too few pgs == >>> >>> The volume pool has 4096 pgs >>> -- >>> ceph osd pool get volumes pg_num >>> pg_num: 4096 >>> --- >>> >>> and >>> >ceph df >>> NAME ID USED %USED MAX AVAIL >>> OBJECTS >>> volumes 4 2830G 0.82 108T >>> 763509 >>> -- >>> >>> How do we fix this, without downtime? >>> >>> Thanks >>> Swami >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users@lists.ceph.com >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > PLEASE NOTE: The information contained in this electronic mail message is > intended only for the use of the designated recipient(s) named above. If the > reader of this message is not the intended recipient, you are hereby notified > that you have received this message in error and that any review, > dissemination, distribution, or copying of this message is strictly > prohibited. If you have received this communication in error, please notify > the sender by telephone or e-mail (as shown above) immediately and destroy > any and all copies of this message in your possession (whether hard copies or > electronically stored copies). _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
