Hi list, I'm wondering why max_sectors_kb is set to 127 with md raid1. This value is at 512 on normal HDDs. If I do a file copy on ext4 on a normal HDD then I can see with blktrace/blkparse that 128 KiB chunks are read and 512 KiB chunks are written. With md raid it looks like this: 124 KiB, 4 KiB, 124 KiB, 4 KiB, ... . This looks very inefficient. So, is there a particular reason that max_sectors_kb is set to 127? Cheers, Sebastian -- Sebastian Riemer Linux Kernel Developer ProfitBricks GmbH Greifswalder Str. 207 10405 Berlin, Germany Tel.: +49 - 30 - 60 98 56 991 - 303 Fax: +49 - 30 - 51 64 09 22 Email: sebastian.riemer@xxxxxxxxxxxxxxxx Web: http://www.profitbricks.com/ Sitz der Gesellschaft: Berlin Registergericht: Amtsgericht Charlottenburg, HRB 125506 B Geschäftsführer: Andreas Gauger, Achim Weiss -- 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
