Thanks. > There's some prefetching and stuff, but the rbd library and RADOS storage are > capable of issuing reads and writes in any size (well, down to the minimal > size of the underlying physical disk). > There are some scenarios where you will see it writing a lot more if you use > layering -- promotion of data happens a full object at a time. > -Greg > > On Thursday, June 5, 2014, Cédric Lemarchand <c.lemarch...@yipikai.org> wrote: > I would think that rbd block are like stripes for RAID or blocks for hard > drives, even if you only need to read or write 1k, the full stripe has to be > read or write. > > Cheers > > -- > Cédric Lemarchand > > > Le 5 juin 2014 à 22:56, Timofey Koolin <timo...@koolin.ru> a écrit : > > > > Do for every read/write rbd read/write full block of data (4MB) or rbd can > > read/wite part of block? > > > > For example - I have a 500MB file (database) and need random read/write by > > blocks about 1-10Kb. > > > > Do for every read 1 Kb rbd will read 4MB from hdd? > > for write? > > > > > > _______________________________________________ > > 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 > > > -- > Software Engineer #42 @ http://inktank.com | http://ceph.com
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