On 5/28/2012 7:56 PM, NeilBrown wrote: > On Tue, 29 May 2012 10:33:52 +1000 Jonathan Molyneux > <jonathan@xxxxxxxxxxxxxxxxxxxx> wrote: >> md1 : active raid6 sde1[0] sdb1[6] sdh1[5] sdc1[4] sdg1[3] sdd1[2] sdf1[1] >> 7325679680 blocks super 0.91 level 6, 64k chunk, algorithm 18 >> [7/6] [UUUUUU_] >> [=========>...........] reshape = 47.0% (689413888/1465135936) >> finish=4126.9min speed=3132K/sec > The only thing to do is to wait. This is very much a seek-bound operation > and there is little room for making it go faster. With SSDs you'd see the throughput of this operation increase by 2 orders of magnitude (100x) or more, as SSDs have application level seek latency of ~50-80 microseconds, over 100x lower than rotational drives which are in the 10-30 millisecond range depending on spindle speed. Of course, cost/GB for the same total storage is 2 to 10 times higher with SSD. Though interestingly the price of SSDs continues to fall, whereas the rotational drive manufacturers are currently keeping drive prices artificially high, between 50-100% higher than last year depending on drive model, in an effort to recoup apparent financial losses caused by the flooding in Thailand. -- Stan -- 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
