[CentOS] ext4, 4k sector alignment
Robert Nichols
rnicholsNOSPAM at comcast.net
Wed Jul 27 00:57:11 UTC 2011
On 07/26/2011 03:53 PM, Les Mikesell wrote:
> Thank you! That seems to have worked, but now I'm curious as to why the
> partition on the old drives didn't go to the end of the disk - which I
> had expected would have left no extra room. Was the dos style rounding
> computing the end of a cylinder wrong?
>
> fdisk -lu /dev/sdh (old 3.5")
> Disk /dev/sdh: 750.1 GB, 750156374016 bytes
> 255 heads, 63 sectors/track, 91201 cylinders, total 1465149168 sectors
> Units = sectors of 1 * 512 = 512 bytes
> Device Boot Start End Blocks Id System
> /dev/sdh1 63 1465144064 732572001 fd Linux raid autodetect
Simple. The drive does not contain an integral number of those arbitrary
255H x 63S cylinders, and with the previous cylinder-aligned partitioning
the partition extended only to the end of the last full cylinder.
--
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Do NOT delete it.
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