> # echo 3 >'/proc/sys/vm/drop_caches' > # dd if=/dev/md127 of=/dev/null count=$((20*1024*1024)) > 20971520+0 records in > 20971520+0 records out > 10737418240 bytes (11 GB) copied, 13.5717 s, 791 MB/s > > Note that I do not expect to get an error because reading the array will not read the P/Q checksums > (it assumes good data and avoids the calculations overhead of verifying P/Q). > > BTW, due to the use of a buffer layer I could have done the whole test using 4k blocks rather than > sectors, but it makes no difference in this case. > > Eyal > I wonder, could you not use dd to perform a "refresh"? dd if=/dev/md127 of=/dev/md127 count=... bs=.... As that would force a re-calc and write of P & Q and data. That said, its just a "could you/would it" suggestion not a "do it" due to the inherent dangers of dd. -- 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
