On Mon, Jan 19, 2015 at 11:38 AM, Fabian Zimmermann <dev....@gmail.com> wrote:
> Hi, > > Am 19.01.15 um 12:24 schrieb Luis Periquito: > > AFAIK there is no such limitation. > > > > When you create a file, that file is split into several objects (4MB IIRC > > each by default), and those objects will get mapped to a PG - > > http://ceph.com/docs/master/rados/operations/placement-groups/ > right, and this pg is mapped to X osd. (X = level of replication). > > Let's assume X=3. > > So, even if I split 2T into 4MB junks, I have to store these 3T at all > osds in this pg, isn't it? > Each object will get mapped to a different PG. The size of an OSD will affect its weight and the number of PGs assigned to it, so a smaller OSD will get less PGs. And BTW, with a replica of 3, a 2TB will need 6TB of storage - each object is replicated 3 times, so taking up triple the space.
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