On Tue, Jan 29, 2013 at 07:43:09PM +0100, Wolfgang Denk wrote: [...] > I am not a friend of quick conclusions in cases like this, but I think > that hardware issues are very unlikely to hit with identical effects > simultaneously on 3 different machines in 2 different locations. Hi Wolfgang, yep, I think the same. If all error report by raid6check, on the three systems, are "unknown", then it seems to be a software problem. > > > > OK, add more hardware details... > > > > > > A: Supermicro X8SAX mainboard, Core i7 CPU 950 @ 3.07GHz, 24 GB RAM > > > H: Supermicro X8ST3 mainboard, Xeon CPU W3565 @ 3.20GHz, 24 GB RAM > > > X: Supermicro X8SAX mainboard, Core i7 CPU 950 @ 3.07GHz, 24 GB RAM > > > > What does the kernel log says about the choosen > > RAID6 algorithm? > > System A: > > [ 57.121902] raid6: sse2x1 7660 MB/s > [ 57.138892] raid6: sse2x2 8687 MB/s > [ 57.155890] raid6: sse2x4 9789 MB/s > [ 57.155891] raid6: using algorithm sse2x4 (9789 MB/s) > [ 57.155892] raid6: using ssse3x2 recovery algorithm > > System H: > > [ 45.360607] raid6: sse2x1 7753 MB/s > [ 45.403614] raid6: sse2x2 8777 MB/s > [ 45.445612] raid6: sse2x4 9773 MB/s > [ 45.472547] raid6: using algorithm sse2x4 (9773 MB/s) > [ 45.503347] raid6: using ssse3x2 recovery algorithm > > System X: > > [ 51.471793] raid6: sse2x1 3996 MB/s > [ 51.517657] raid6: sse2x2 4851 MB/s > [ 51.566579] raid6: sse2x4 4960 MB/s > [ 51.598831] raid6: using algorithm sse2x4 (4960 MB/s) > [ 51.638697] raid6: using ssse3x2 recovery algorithm This ssse3x3 I do not know, it seems new to me, but I might be wrong, we would need someone with more insight of RAID6 implementation. > Note: I remembered that I converted yet another machine which has a > (smaller) RAID6 array (4 x SAMSUNG SpinPoint F1 HE502IJ) on a less > powerful PC (Gigabyte P35-DS3R mainboard, Intel Core 2 Duo CPU E6750 > @ 2.66GHz, 8 GB RAM). This shows NO problems (so far). Here I have: > > [ 11.253015] raid6: sse2x1 1902 MB/s > [ 11.270021] raid6: sse2x2 2296 MB/s > [ 11.287274] raid6: sse2x4 3171 MB/s > [ 11.287533] raid6: using algorithm sse2x4 (3171 MB/s) > [ 11.288127] raid6: using ssse3x2 recovery algorithm > > > If you can draw any conclusions from that - I can't. It is also the slower... Nevertheless, at this point, I cannot draw any conclusions too... Sorry. bye, -- piergiorgio -- 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
