Hello Roger. >I have noticed on simple tests making arrays with tmpfs that Intel >cpus seem to be able to xor about 2x the speed of AMD. The speed may >also vary based on cpu generation. It was Intel in both cases and the CPU loads were low. > Also, grow differs in the fact that blocks get moved around hence the writes. Of course, but even of that the speed was poor :] > On the raid you are building, is there other IO going on to the disks? Nope, the array was not mounted and no process was touching the MD device during the rebuild. > And if the disk has not failed you can do a --replace so long as you In the first case there was no space left for another drive ... however, sometimes I can do the rebuild offline and in such cases I'll rather clone the content of the old drive with DD. It's much faster. > I also carefully setup the disk partition naming such that the last > digit of the partitions matches the last digit of the md as that makes > the adding/re-adding simpler as I know which device it always is. I usually do that on servers where I have multiple raid partitions. Thx, Jaromir.
