On 02/01/18 02:36, linghucongsong wrote: > Hi, all! > > I just use ceph rbd for openstack. > > my ceph version is 10.2.7. > > I find a surprise thing that the object save in the osd , in some pgs the > objects are 8M, and in some pgs the objects are 4M, can someone tell me why? > thanks! > > root@node04:/var/lib/ceph/osd/ceph-3/current/1.6e_head/DIR_E/DIR_6# ll -h > -rw-r--r-- 1 ceph ceph 8.0M Dec 14 14:36 > rbd\udata.0f5c1a238e1f29.000000000000012a__head_6967626E__1 > > root@node04:/var/lib/ceph/osd/ceph-3/current/3.13_head/DIR_3/DIR_1/DIR_3/DIR_6# > ll -h > -rw-r--r-- 1 ceph ceph 4.0M Oct 24 17:39 > rbd\udata.106f835ba64e8d.00000000000004dc__head_5B646313__3 By default, rbds are striped across 4M objects, but that is a configurable value - you can make it larger or smaller if you like. I note that the PGs you are looking at are from different pools (1.xx vs 3.xx) - so I'm guessing you have multiple storage pools configured in your openstack cluster. Is it possible that for the larger ones, the rbd_store_chunk_size parameter is being overridden?
Rich
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