Hi, On Sunday 12 May 2013 18:05:16 Leen Besselink wrote: > > I did see you mentioned you wanted to have, many disks in the same machine. > > Not just machines with let's say 12 disks for example. > > Did you know you need the CPU-power of a 1Ghz Xeon core per OSD for the > times when recovery is happening ? Nope, did not know it. The current intent is to install 2x 2.4 Ghz xeon CPU, handeling 8 threads each. So, 2*8*2.4=38.4 for max OSD's. It should be fine. If I would go for the 72 disk option, I have to consider doubling that power. The current max I can select from the dealer I am looking at, for the socket housed in the supermicro 72x 3.5" version are 2x a Xeon x5680. Utilizing 12 threads each, at 3.33Ghz. So, 2*12*3.33=79.79 for max OSD's. Also this should be fine. What will happen if the CPU is maxed out anyway? Slowing things or crashing things? In my opinion it is not a bad thing if a system is maxed out in such a massive migration, which should not occur on a daily base. Sure, a disk that fails every two weeks, no prob. What are we talking about? 0.3% of the complete storage cluster. Even 0.15% if I would take the 72x3.5" servers. If a complete server stops working, that is something else. But as I said in a different split of this thread: if that happens I have got different things to worry about, than a slow migration of data. As long as there is no data lost, I don't really care it takes a bit longer. Thanks for the advise. Tim _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |