On Sat, 14 Jun 2014, Ke-fei Lin wrote: > 2014-06-14 0:11 GMT+08:00 Sage Weil <s...@inktank.com>: > > Right now, no. > > > > We could add a minimum read size to librbd when caching is enabled... > > that would not be particularly difficult. > > > > sage > > Thanks, so is it possible to set some options like *readahead* in librbd > or QEMU? Seems no docs mentioned this...
We've stayed away from readahead because this is normally done by the fs sitting on top of RBD. > By the way I found a discussion (1 year ago) about persistent caching > on QEMU's mailing list: > https://lists.gnu.org/archive/html/qemu-devel/2013-06/msg03649.html > Is there any work currently in progress? Nope! There was a blueprint on the subject a few CDS's ago, though: http://wiki.ceph.com/Planning/Sideboard/rbd%3A_shared_read_cache http://pad.ceph.com/p/rbd-shared-read-cache http://www.youtube.com/watch?v=SVgBdUv_Lv4&t=70m11s sage _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
