Hi, On Mon, Jul 22, 2013 at 2:08 AM, Chen, Xiaoxi <xiaoxi.c...@intel.com> wrote:
> Hi, > > ** ** > > > Can you share any information on the SSD you are using, is it > PCIe connected?**** > > Depends, if you use HDD as your OSD data disk, a SATA/SAS SSD is > enough for you. Instead of Intel 520, I would like to suggest you use the > Intel DCS3700 since it provide better durability for write. Since a DCS3700 > can provide 400~500MB/s for write and HDD can only have ~100MB/s ,it’s safe > for a DCS3700 to provide journal for 4~5 HDDs. > Indeed, I am using 2TB SATA 7200 drives in the OSDs, but unable to make room for the SSD, not even for a 2.5" drive. Considering using a mSATA to PCIe adapter with a SATA III mSATA SSD. Any thoughts on what to expect from this combination? > **** > > And , if you have some insight/assumption on your workload, say “ > I don’t care throughtput at all , all my workload doing random access”. > With such assumption , you can have very high SSD:HDD ratio, 8:1 or even > 10:1 will also be fine > My workload will be read and write heavy, mostly random I/O (mail servers, OpenStack VMs, multi-node video recording and streaming), I'm afraid this will kill smaller SSDs too quickly to be sustainable, not so? Charles
_______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
