最近，我的 RAID 中的一个驱动器坏了，我正在更换一个新驱动器。我用了这个答案镜像我的旧驱动器上的分区以进行重新同步。但我担心的是输出。我的驱动器是 4k 扇区，我第一次做错了什么吗？
Checking that no-one is using this disk right now ...
OK
Warning: partition 1 does not end at a cylinder boundary
Warning: partition 2 does not start at a cylinder boundary
Warning: partition 2 does not end at a cylinder boundary
Warning: partition 3 does not start at a cylinder boundary
Warning: partition 3 does not end at a cylinder boundary
Warning: partition 4 does not start at a cylinder boundary
Disk /dev/sda: 121601 cylinders, 255 heads, 63 sectors/track
Old situation:
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
Device Boot Start End #cyls #blocks Id System
/dev/sda1 * 0+ 12- 13- 102400 fd Linux raid autodetect
/dev/sda2 12+ 1318- 1306- 10485760 fd Linux raid autodetect
/dev/sda3 1318+ 2623- 1306- 10485760 fd Linux raid autodetect
/dev/sda4 2623+ 121600 118978- 955685088+ fd Linux raid autodetect
New situation:
Units = sectors of 512 bytes, counting from 0
Device Boot Start End #sectors Id System
/dev/sda1 * 2048 206847 204800 fd Linux raid autodetect
/dev/sda2 206848 21178367 20971520 fd Linux raid autodetect
/dev/sda3 21178368 42149887 20971520 fd Linux raid autodetect
/dev/sda4 42149888 1953520064 1911370177 fd Linux raid autodetect
Successfully wrote the new partition table
Re-reading the partition table ...
If you created or changed a DOS partition, /dev/foo7, say, then use dd(1)
to zero the first 512 bytes: dd if=/dev/zero of=/dev/foo7 bs=512 count=1
(See fdisk(8).)
答案1
不以柱面边界结束的分区可能会影响一些敏感的操作系统及其分区程序。你的磁盘只有Linux分区，所以我猜你只在Linux下使用它； Linux 不在乎。
如果您的磁盘有 4kB 扇区，那么如果您的分区与 4kB 对齐，您将获得更好的性能。事后实现这一点很困难，但幸运的是，所有分区都已经有 4kB 对齐。