> I am checking raid5 performance. reads or writes? > I am using asynchronous ios with buffer size as the stripe size. why do you think async matters? > In this case i am using a stripe size of 1M with 2+1 disks. do you mean that md says you have 512k chunks? > Unlike raid0 , raid5 drops the performance by 50% . that's slightly unclear: -50% relative to what? a raw single disk? is this reads or writes? strictly bandwidth, and if so, do you have multiple outstanding reads? > Is it because it does parity checkings ? non-degraded R5 doesn't do parity checks on reads, afaik. - 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
