On Mar 12, 2007 04:27 +0100, Jan Engelhardt wrote: > Assume this partition table on my current HD: > > Disk /dev/hdc: 251.0 GB, 251000193024 bytes > 255 heads, 63 sectors/track, 30515 cylinders > Units = cylinders of 16065 * 512 = 8225280 bytes > > Device Start End Blocks Id System > /dev/hdc1 1 33 265041 82 Linux swap / Solaris > /dev/hdc2 34 30515 244846665 5 Extended > > That is, 255 * 63 * 30515 * 512 == roughly 251 GB. > > Now, if this disk was copied byte per byte (/bin/dd) to a > 4096-based disk, and Linux would start using a sector size of > 4096 The easy answer is "don't do that". You should make a new partition table on the 4096-byte sector drive (each of the partitions at least as large as the old ones), and then copy the content of each of the partitions separately onto the new disk. > Although I would not mind the 2 TB, the partition table would > read quite differently (note the Blocks column which is > multiplied by 4 (512x4=4096)) > > Device Start End Blocks Id System > /dev/hdc1 1 33 1060164 82 Linux swap / Solaris > /dev/hdc2 34 30515 979386660 5 Extended > > Which would mean that the swap partition reaches into the real > data partition and would corrupt it. In the same way you can't copy raw disks from one vendor's RAID 5 array and put them into another vendor's (or even model's) RAID 5 array, or you can't do a raw copy of a partitioned disk and expect it to suddenly become an LVM volume, you can't do raw disk copies between drives with different sector size. You also won't be able to use a copy of an ext3 filesystems with 1kB blocksize onto a 4kB sector size device - the ext3 code will detect this and refuse to mount. At that point you need to do a tar/untar (or whatever) to copy the data instead of a raw partition copy. Cheers, Andreas -- Andreas Dilger Principal Software Engineer Cluster File Systems, Inc. - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
