On Mon, Dec 14, 2015 at 2:40 PM, Mark Knecht <markknecht@xxxxxxxxx> wrote: > > > On Mon, Dec 14, 2015 at 12:14 PM, Dallas Clement > <dallas.a.clement@xxxxxxxxx> wrote: >> >> <SNIP> >> >> Hi Phil, I ran blktrace while writing with dd to a RAID 5 device with >> 12 disks. My chunk size is 128K. So I set my block size to 128K * >> (12-2) = 1280k. Here is the dd command I ran. > > Just curious but for my own knowledge if it's RAID5 why is it 12-2? > > - Mark > Just curious but for my own knowledge if it's RAID5 why is it 12-2? Shouldn't be. It should have been 12-1 or writing 1408k. Boy do I feel dumb. Anyhow, when writing this value, no more RMWs. Yay! -- 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
