On Fri, Apr 15, 2011 at 6:10 PM, Fyodor Ustinov <[email protected]> wrote: > Hi. > > Looking the sources I noticed that the "rule" in CRUSH may be type "raid4". > > Because of this, I have a question: Is it possible to organize the 20 OSD > servers in the scheme 4 * (4+1)? I.e. like a stripe from 4 of raid4 sets? > > Plain "replication level = 2" is too expensive by "used space". > > WBR, > Fyodor.
Unfortunately, no. CRUSH and some of the other auxiliary bits can do the mappings required to support RAID, but none of the core code required to do that is implemented. It's in mind as something that would be nice to have in the future, but is much more complicated than simple replication schemes. -Greg -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
