On Thu, Mar 15, 2012 at 06:15:49PM +0100, keld@xxxxxxxxxx wrote: > On Fri, Mar 16, 2012 at 12:52:19AM +0800, Jessie Evangelista wrote: > > Hi keld, > > > > On Thu, Mar 15, 2012 at 11:25 PM, <keld@xxxxxxxxxx> wrote: > > > On Thu, Mar 15, 2012 at 02:07:25PM +0000, Peter Grandi wrote: > > >> >>> I want to create a raid10,n2 using 3 1TB SATA drives. > > >> >>> I want to create an xfs filesystem on top of it. The > > >> >>> filesystem will be used as NFS/Samba storage. > > >> > > >> Consider also an 'o2' layout (it is probably the same thing for a > > >> 3 drive RAID10) or even a RAID5, as 3 drives and this usage seems > > >> one of the few cases where RAID5 may be plausible. > > > > > > Well, for a file server like NFS/Samba, you could also consider raid10,f2. > > > I would think you could get about double the read performance compared to n2 and o2 > > > layouts, and also for individual read transfers on a running system > > > you would get somthing like double the read performance. > > > Write performance could be somewhat slower (0 to 10 %) bot as users > > > are not waiting for writes to complete, they will probably not notice. > > > > I also plan to try raid10f2. Did you do your own benchmarks or are you > > quoting someone elses? > > Both, look at our wiki: https://raid.wiki.kernel.org/articles/p/e/r/Performance.html I think it would be interesting to include your figures on the wiki page, if you publish them here on the list. Maybe we should rearrange the wiki page a little. I am not so happy about the data reported in the section "New benchmarks from 2011" as it only illustrates what is happening with a 100 % used CPU. I would like to move it to a separate page. Also the really old data in section "Old performance benchmark" should be moved to a separate page, IMHO. The text on the wiki page should be gaving info of general interest for systems running today (still IMHO). Comments? Best regards keld -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
