On 09/18/2016 02:17 PM, Wols Lists wrote: > > I'm sure you know this, but getting the physical/logical block size > out-of-sync hurts disk performance. And copying a smaller partition into > a larger allocated space is perfectly harmless. So... > > I'd simply use a modern partition manager (such as gdisk) to partition > your new drives such that the new partitions are larger than the > existing ones, and are properly aligned relative to the drive geometry. > > Then copy the old partitions across however you were planning - whether > it's "mdadm --replace" or stopping the array and "dd old-device > new-device" or whatever. > > If you've got a bit of wasted space, or whatever, who cares. > You can resize your file-systems to use all available space, if you wish > (can't remember how, whenever I've done that sort of stuff it hasn't > been hard). > > But I'd certainly try and avoid those offset warnings - it smacks to me > of a mismatch between 512-byte blocks and 4K disk sectors, and I > wouldn't want the drive firmware messing about correcting mismatches > between OS 4K blocks and drive 4K blocks. I don't fully understand it > but I know there was a lot of grief with exactly this sort of thing in > the transition from 512-byte to 4K. > Aha! That's what I needed to know. I was wondering if I can make a partition (I think) that's 3/4 of a block larger (3072bytes) than the original /dev/sdX1's on the old HD103SJs drives. You've answered my question perfectly. I can use sfdisk or parted to get that done... Thanks a bunch! -Ben -- 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
