Compared to ceph-osd overhead, the dm-crypt overhead will be completely negligible for most scenarios. One exception could be sequential reads with slow CPU (not supporting AES), but I don't expect more than a few percent difference even then.
Btw nicer solution is to use SED drives. Spindles are no problem (Hitachi makes them for example), SSDs are trickier - DC-class Intels don't support it for example. Jan > On 20 Mar 2016, at 17:53, Daniel Delin <li...@ddelin.se> wrote: > > Hi, > > I´m looking into running a Ceph cluster with the OSDs encrypted with > dm-crypt, both > spinning disks and cache-tier SSDs and I wonder if there are any solid data > on the > possible performance penalty this will incur, both bandwidth and latency. > Done some googling, but can´t find that much. > > The CPUs involved will have hardware AES-NI support, 4 spinning disks and 2 > cache tier > SSDs / OSD node. > _______________________________________________ > 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
