But can we change the pg_num of a pool when the pool contains data? If yes, how to do this? -----Original Message----- From: ceph-devel-owner@xxxxxxxxxxxxxxx [mailto:ceph-devel-owner@xxxxxxxxxxxxxxx] On Behalf Of Sage Weil Sent: 2013年2月6日 9:50 To: Mandell Degerness Cc: ceph-devel@xxxxxxxxxxxxxxx Subject: Re: Increase number of pg in running system On Tue, 5 Feb 2013, Mandell Degerness wrote: > I would like very much to specify pg_num and pgp_num for the default > pools, but they are defaulting to 64 (no OSDs are defined in the > config file). I have tried using the options indicated by Artem, but > they didn't seem to have any effect on the data and rbd pools which > are created by default. Is there something I am missing? Ah, I see. Specifying this is awkward. In [mon] or [global], osd pg bits = N osd pgp bits = N where N is the the number of bits to shift 1 to the left. So for 1024 PGs, you'd do 10. (What it's actually doing is MIN(1, num_osds) << N. The default N is 6, so you're probaby seeing 64 PGs per pool by default.) sage > > On Tue, Feb 5, 2013 at 6:40 AM, ArtemGr <artemciy@xxxxxxxxx> wrote: > > Martin B Nielsen <martin <at> unity3d.com> writes: > >> Hi, > >> > >> Looking at: > >> http://ceph.com/docs/master/rados/operations/pools/ > >> > >> It has this description roughly in the middle: > >> > >> --------------- > >> Important > >> Increasing the number of placement groups in a pool after you > >> create the pool is still an experimental feature in Bobtail (v > >> 0.56). We recommend defining a reasonable number of placement > >> groups and maintaining that number until Ceph?s placement group > >> splitting and merging functionality matures. > >> --------------- > >> > >> However, I cannot find any references how to do this? > >> > >> I'm asking since we have a test system with 10TB data with only the > >> default 8 PG's created. > > > > Here's how I do it in ceph.conf: > > > > [osd] > > ; Increase groups number in order to decrease scrub size > > osd pool default pg num = 64 > > osd pool default pgp num = 64 > > > > > > -- > > To unsubscribe from this list: send the line "unsubscribe > > ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" > in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo > info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html ?韬{.n?????%??檩??w?{.n????u朕?Ф?塄}?财??j:+v?? ? ???2??璀??摺?囤??z夸z罐?+?????w棹f
